| barebacked | (adjective) riding without a saddle | Synonyms: bareback |
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| (adverb) without a saddle | Synonyms: bareback |
| barmbrack | (noun) a rich currant cake or bun | - |
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| barrack | (noun) a building or group of buildings used to house military personnel | - |
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| (verb) laugh at with contempt and derision | Synonyms: flout, gibe, jeer, scoff |
| (verb) spur on or encourage especially by cheers and shouts | Synonyms: cheer, exhort, inspire, pep up, root on, urge, urge on |
| (verb) lodge in barracks | - |
| barracking | (noun) shouting to interrupt a speech with which you disagree | Synonyms: heckling |
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| bioattack | (noun) the use of bacteria or viruses or toxins to destroy men and animals or food | Synonyms: biologic attack, biological attack, biological warfare, BW |
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| biofeedback | (noun) a training program in which a person is given information about physiological processes (heart rate or blood pressure) that is not normally available with the goal of gaining conscious control of them | - |
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| bivouacking | (noun) the act of encamping and living in tents in a camp | Synonyms: camping, encampment, tenting |
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| black | (adjective) being of the achromatic color of maximum darkness; having little or no hue owing to absorption of almost all incident light | - |
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| (adjective) of or belonging to a racial group especially of sub-Saharan African origin | - |
| (adjective) marked by anger or resentment or hostility | - |
| (adjective) (of the face) made black especially as with suffused blood | Synonyms: blackened |
| (adjective) (of intelligence operations) deliberately misleading | - |
| (adjective) extremely dark | Synonyms: pitch-black, pitch-dark |
| (adjective) soiled with dirt or soot | Synonyms: smutty |
| (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: disgraceful, ignominious, inglorious, opprobrious, shameful |
| (adjective) stemming from evil characteristics or forces; wicked or dishonorable | Synonyms: dark, sinister |
| (adjective) offering little or no hope | Synonyms: bleak, dim |
| (adjective) distributed or sold illicitly | Synonyms: black-market, bootleg, contraband, smuggled |
| (adjective) harshly ironic or sinister | Synonyms: grim, mordant |
| (adjective) (of coffee) without cream or sugar | - |
| (adjective) (of events) having extremely unfortunate or dire consequences; bringing ruin | Synonyms: calamitous, disastrous, fatal, fateful |
| (noun) black clothing (worn as a sign of mourning) | - |
| (noun) (board games) the darker pieces | - |
| (noun) the quality or state of the achromatic color of least lightness (bearing the least resemblance to white) | Synonyms: blackness, inkiness |
| (noun) total absence of light | Synonyms: blackness, lightlessness, pitch blackness, total darkness |
| (verb) make or become black | Synonyms: blacken, melanise, melanize |
| blackamoor | (noun) a person with dark skin who comes from Africa (or whose ancestors came from Africa) | Synonyms: Black person |
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| blackball | (noun) the act of excluding someone by a negative vote or veto | Synonyms: barring |
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| (verb) expel from a community or group | Synonyms: ban, banish, cast out, ostracise, ostracize, shun |
| (verb) vote against; refuse to endorse; refuse to assent | Synonyms: negative, veto |
| blackbeetle | (noun) dark brown cockroach originally from orient now nearly cosmopolitan in distribution | Synonyms: Asiatic cockroach, Blatta orientalis, oriental cockroach, oriental roach |
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| blackberry | (noun) large sweet black or very dark purple edible aggregate fruit of any of various bushes of the genus Rubus | - |
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| (noun) bramble with sweet edible black or dark purple berries that usually do not separate from the receptacle | Synonyms: blackberry bush |
| (verb) pick or gather blackberries | - |
| blackbird | (noun) any bird of the family Icteridae whose male is black or predominantly black | Synonyms: New World blackbird |
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| (noun) common black European thrush | Synonyms: European blackbird, merl, merle, ousel, ouzel, Turdus merula |
| blackboard | (noun) sheet of slate; for writing with chalk | Synonyms: chalkboard |
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| blackbody | (noun) a hypothetical object capable of absorbing all the electromagnetic radiation falling on it | Synonyms: black body, full radiator |
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| blackbuck | (noun) common Indian antelope with a dark back and spiral horns | Synonyms: Antilope cervicapra, black buck |
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| blackcap | (noun) small brownish-grey warbler with a black crown | Synonyms: Silvia atricapilla |
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| (noun) chickadee having a dark crown | Synonyms: black-capped chickadee, Parus atricapillus |
| (noun) small black-headed European gull | Synonyms: Larus ridibundus, laughing gull, pewit, pewit gull |
| (noun) raspberry native to eastern North America having black thimble-shaped fruit | Synonyms: black raspberry, blackcap raspberry, Rubus occidentalis, thimbleberry |
| blackcock | (noun) male black grouse | Synonyms: black cock |
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| blackdamp | (noun) the atmosphere in a mine following an explosion; high in carbon dioxide and incapable of supporting life | Synonyms: chokedamp |
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| blacken | (verb) make or become black | Synonyms: black, melanise, melanize |
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| (verb) burn slightly and superficially so as to affect color | Synonyms: char, scorch, sear |
| blackened | (adjective) (of the face) made black especially as with suffused blood | Synonyms: black |
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| (adjective) darkened by smoke | - |
| blackening | (noun) changing to a darker color | Synonyms: darkening |
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| blackface | (noun) the makeup (usually burnt cork) used by a performer in order to imitate a Negro | - |
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| blackfish | (noun) female salmon that has recently spawned | - |
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| (noun) small dark-colored whale of the Atlantic coast of the United States; the largest male acts as pilot or leader for the school | Synonyms: black whale, common blackfish, Globicephala melaena, pilot whale |
| (noun) large dark-colored food fish of the Atlantic coast of North America | Synonyms: tautog, Tautoga onitis |
| blackfly | (noun) small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals | Synonyms: black fly, buffalo gnat |
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| (noun) blackish aphid that infests e.g. beans and sugar beets | Synonyms: Aphis fabae, bean aphid |
| blackguard | (noun) someone who is morally reprehensible | Synonyms: bounder, cad, dog, heel, hound |
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| (verb) use foul or abusive language towards | Synonyms: abuse, clapperclaw, shout |
| (verb) subject to laughter or ridicule | Synonyms: guy, jest at, laugh at, make fun, poke fun, rib, ridicule, roast |
| blackguardly | (adjective) lacking principles or scruples | Synonyms: rascally, roguish, scoundrelly |
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| blackhead | (noun) a black-tipped plug clogging a pore of the skin | Synonyms: comedo |
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| blackheart | (noun) heart cherry with dark flesh and skin | Synonyms: blackheart cherry |
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| (noun) any of various diseases in which the central tissues blacken | - |
| blacking | (noun) a substance used to produce a shiny protective surface on footwear | Synonyms: shoe polish |
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| blackish | (adjective) of something that is somewhat black | - |
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| blackjack | (noun) a gambling game using cards; the object is to hold cards having a higher count than those dealt to the banker up to but not exceeding 21 | Synonyms: twenty-one, vingt-et-un |
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| (noun) a piece of metal covered by leather with a flexible handle; used for hitting people | Synonyms: cosh, sap |
| (noun) a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship | Synonyms: black flag, Jolly Roger, pirate flag |
| (noun) a common scrubby deciduous tree of central and southeastern United States having dark bark and broad three-lobed (club-shaped) leaves; tends to form dense thickets | Synonyms: blackjack oak, jack oak, Quercus marilandica |
| (verb) exert pressure on someone through threats | Synonyms: blackmail, pressure |
| blacklead | (verb) cover with graphite | - |
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| blackleg | (noun) someone who works (or provides workers) during a strike | Synonyms: rat, scab, strikebreaker |
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| (verb) take the place of work of someone on strike | Synonyms: fink, rat, scab |
| blacklist | (noun) a list of people who are out of favor | Synonyms: black book, shitlist |
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| (verb) put on a blacklist so as to banish or cause to be boycotted | - |
| blackmail | (noun) extortion of money by threats to divulge discrediting information | - |
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| (verb) obtain through threats | - |
| (verb) exert pressure on someone through threats | Synonyms: blackjack, pressure |
| blackmailer | (noun) a criminal who extorts money from someone by threatening to expose embarrassing information about them | Synonyms: extortioner, extortionist |
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| blackness | (noun) the quality or state of the achromatic color of least lightness (bearing the least resemblance to white) | Synonyms: black, inkiness |
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| (noun) total absence of light | Synonyms: black, lightlessness, pitch blackness, total darkness |
| blackout | (noun) a momentary loss of consciousness | - |
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| (noun) partial or total loss of memory | Synonyms: amnesia, memory loss |
| (noun) the failure of electric power for a general region | - |
| (noun) darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft) | Synonyms: brownout, dimout |
| (noun) a suspension of radio or tv broadcasting | - |
| blackpoll | (noun) North American warbler having a black-and-white head | Synonyms: Dendroica striate |
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| blackseed | (noun) grass native to West Indies but common in southern United States having tufted wiry stems often infested with a dark fungus | Synonyms: carpet grass, smut grass, Sporobolus poiretii |
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| blacksmith | (noun) a smith who forges and shapes iron with a hammer and anvil | - |
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| blacksnake | (noun) blackish racer of the eastern United States that grows to six feet | Synonyms: black racer, Coluber constrictor |
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| (noun) large harmless shiny black North American snake | Synonyms: black rat snake, Elaphe obsoleta, mountain blacksnake, pilot blacksnake |
| blacktail | (noun) mule deer of western Rocky Mountains | Synonyms: black-tailed deer, blacktail deer, Odocoileus hemionus columbianus |
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| blackthorn | (noun) erect and almost thornless American hawthorn with somewhat pear-shaped berries | Synonyms: Crataegus calpodendron, Crataegus tomentosa, pear haw, pear hawthorn |
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| (noun) a thorny Eurasian bush with plumlike fruits | Synonyms: Prunus spinosa, sloe |
| blacktop | (noun) a black bituminous material used for paving roads or other areas; usually spread over crushed rock | Synonyms: blacktopping |
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| (verb) coat with blacktop | - |
| blacktopping | (noun) a black bituminous material used for paving roads or other areas; usually spread over crushed rock | Synonyms: blacktop |
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| blackwash | (noun) a wash that colors a surface black | - |
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| (noun) a mixture of calomel and limewater that is used on syphilitic sores | Synonyms: black lotion |
| (noun) an attack intended to ruin someone's reputation | Synonyms: assassination, character assassination |
| (verb) color with blackwash | - |
| (verb) bring (information) out of concealment | - |
| blackwater | (noun) any of several human or animal diseases characterized by dark urine resulting from rapid breakdown of red blood cells | - |
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| blackwood | (noun) any of several hardwood trees yielding very dark-colored wood | Synonyms: blackwood tree |
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| (noun) very dark wood of any of several blackwood trees | - |
| bladderwrack | (noun) a common rockweed used in preparing kelp and as manure | Synonyms: black rockweed, bladder fucus, Fucus vesiculosus, tang |
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| (noun) similar to and found with black rockweed | Synonyms: Ascophyllum nodosum |
| blowback | (noun) Blowback is a system of operation for self-loading firearms that obtains energy from the motion of the cartridge case as it is pushed to the rear by expanding gases created by the ignition of the propellant charge. | - |
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| (noun) misinformation resulting from the recirculation into the source country of disinformation previously planted abroad by that country's intelligence service | - |
| (noun) the backward escape of gases and unburned gunpowder after a gun is fired | Synonyms: backfire |
| bluejacket | (noun) a serviceman in the navy | Synonyms: navy man, sailor, sailor boy |
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| bootblack | (noun) a person who polishes shoes and boots | Synonyms: shoeblack |
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| bootjack | (noun) has V-shaped notch for pulling off boots | - |
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| bracken | (noun) large coarse fern often several feet high; essentially weed ferns; cosmopolitan | Synonyms: brake, pasture brake, Pteridium aquilinum |
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| (noun) fern of southeastern Asia; not hardy in cold temperate regions | Synonyms: Pteridium esculentum |
| bracket | (noun) a support projecting from a wall (as to hold a shelf) | Synonyms: wall bracket |
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| (noun) either of two punctuation marks ([ or ]) used to enclose textual material | Synonyms: square bracket |
| (noun) either of two punctuation marks (`<' or `>') used in computer programming and sometimes used to enclose textual material | Synonyms: angle bracket |
| (noun) a category falling within certain defined limits | - |
| (verb) classify or group | - |
| (verb) place into brackets | Synonyms: bracket out |
| (verb) support with brackets | - |
| brackish | (adjective) slightly salty (especially from containing a mixture of seawater and fresh water) | Synonyms: briny |
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| (adjective) distasteful and unpleasant; spoiled by mixture | - |
| brackishness | (noun) the quality of being salty, as the saltiness of water | - |
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| bushwhack | (verb) wait in hiding to attack | Synonyms: ambuscade, ambush, lie in wait, lurk, scupper, waylay |
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| (verb) cut one's way through the woods or bush | - |
| (verb) live in the bush as a fugitive or as a guerilla | - |
| bushwhacker | (noun) a disparaging term for an unsophisticated person | Synonyms: hillbilly |
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| (noun) a Confederate guerrilla during the American Civil War | - |
| bushwhacking | (adjective) lying in ambush | - |
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| buyback | (noun) the act of purchasing back something previously sold | Synonyms: redemption, repurchase |
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| cackel | (verb) make a cackling sound | - |
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| cackle | (noun) a loud laugh suggestive of a hen's cackle | - |
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| (noun) noisy talk | Synonyms: chatter, yack, yak, yakety-yak |
| (noun) the sound made by a hen after laying an egg | - |
| (verb) emit a loud, unpleasant kind of laughing | - |
| (verb) squawk shrilly and loudly, characteristic of hens | - |
| (verb) talk or utter in a cackling manner | - |
| (verb) make a noise characteristic of a goose | Synonyms: gaggle |
| cackler | (noun) a hen that has just laid an egg and emits a shrill squawk | - |
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| (noun) any of various insectivorous Old World birds with a loud incessant song; in some classifications considered members of the family Muscicapidae | Synonyms: babbler |
| cackly | (adjective) like the cackles or squawks a hen makes especially after laying an egg | Synonyms: squawky |
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| caipiblack | (noun) a variation of the Caipirinha made with black vodka instead of cachaça. | - |
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| callback | (noun) a request by the manufacturer of a defective product to return the product (as for replacement or repair) | Synonyms: recall |
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| calpack | (noun) a high-crowned black cap (usually made of felt or sheepskin) worn by men in Turkey and Iran and the Caucasus | Synonyms: calpac, kalpac |
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| canvasback | (noun) North American wild duck valued for sport and food | Synonyms: Aythya valisineria, canvasback duck |
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| carack | (noun) a large galleon sailed in the Mediterranean as a merchantman | Synonyms: carrack |
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| carjack | (verb) take someone's car from him by force, usually with the intention of stealing it | - |
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| carjacking | (noun) the violent theft of an occupied car | - |
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| carrack | (noun) a large galleon sailed in the Mediterranean as a merchantman | Synonyms: carack |
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| cheapjack | (adjective) made of inferior workmanship and materials | Synonyms: shoddy, tawdry |
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| (noun) a peddler of inferior goods | - |
| chimneystack | (noun) the part of the chimney that is above the roof; usually has several flues | - |
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| clack | (noun) a simple valve with a hinge on one side; allows fluid to flow in only one direction | Synonyms: clack valve, clapper valve |
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| (noun) a sharp abrupt noise as if two objects hit together; may be repeated | Synonyms: clap |
| (verb) speak (about unimportant matters) rapidly and incessantly | Synonyms: blab, blabber, chatter, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle |
| (verb) make a clucking sounds, characteristic of hens | Synonyms: click, cluck |
| (verb) make a rattling sound | Synonyms: brattle, clatter |
| clawback | (noun) finding a way to take money back from people that they were given in another way | - |
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| coatrack | (noun) a rack with hooks for temporarily holding coats and hats | Synonyms: coat rack, hatrack |
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| comeback | (noun) return by a celebrity to some previously successful activity | - |
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| (noun) a quick reply to a question or remark (especially a witty or critical one) | Synonyms: counter, rejoinder, replication, retort, return, riposte |
| cornerback | (noun) a defensive football player stationed outside the linebackers | - |
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| counterattack | (noun) an attack by a defending force against an attacking enemy force in order to regain lost ground or cut off enemy advance units etc. | Synonyms: countermove |
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| (noun) (chess) an attack that is intended to counter the opponent's advantage in another part of the board | Synonyms: counterplay |
| (verb) make a counterattack | Synonyms: counterstrike |
| coxsackievirus | (noun) enterovirus causing a disease resembling poliomyelitis but without paralysis | Synonyms: Coxsackie virus |
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| crack | (adjective) of the highest quality | Synonyms: A-one, ace, first-rate, super, tiptop, top-notch, topnotch, tops |
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| (noun) the act of cracking something | Synonyms: cracking, fracture |
| (noun) a usually brief attempt | Synonyms: fling, go, offer, pass, whirl |
| (noun) a narrow opening | Synonyms: gap |
| (noun) a purified and potent form of cocaine that is smoked rather than snorted; highly addictive | Synonyms: crack cocaine, tornado |
| (noun) a blemish resulting from a break without complete separation of the parts | - |
| (noun) witty remark | Synonyms: quip, sally, wisecrack |
| (noun) a sudden sharp noise | Synonyms: cracking, snap |
| (noun) a long narrow cleft | Synonyms: cleft, crevice, fissure, scissure |
| (noun) a long narrow depression in a surface | Synonyms: chap, cranny, crevice, fissure |
| (noun) a chance to do something | Synonyms: shot |
| (verb) break suddenly and abruptly, as under tension | Synonyms: snap |
| (verb) become fractured; break or crack on the surface only | Synonyms: break, check |
| (verb) break partially but keep its integrity | - |
| (verb) cause to become cracked | - |
| (verb) reduce (petroleum) to a simpler compound by cracking | - |
| (verb) break into simpler molecules by means of heat | - |
| (verb) pass through (a barrier) | Synonyms: break through |
| (verb) tell spontaneously | - |
| (verb) hit forcefully; deal a hard blow, making a cracking noise | - |
| (verb) suffer a nervous breakdown | Synonyms: break up, collapse, crack up, crock up |
| (verb) make a sharp sound | Synonyms: snap |
| (verb) make a very sharp explosive sound | - |
| (verb) gain unauthorized access computers with malicious intentions | - |
| crackbrained | (adjective) insanely irresponsible | Synonyms: idiotic |
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| crackdown | (noun) severely repressive actions | - |
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| cracked | (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, bonkers, buggy, crackers, daft, dotty, fruity, haywire, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
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| (adjective) of paint or varnish; having the appearance of alligator hide | Synonyms: alligatored |
| (adjective) used of skin roughened as a result of cold or exposure | Synonyms: chapped, roughened |
| cracker | (noun) a party favor consisting of a paper roll (usually containing candy or a small favor) that pops when pulled at both ends | Synonyms: cracker bonbon, snapper |
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| (noun) firework consisting of a small explosive charge and fuse in a heavy paper casing | Synonyms: banger, firecracker |
| (noun) a thin crisp wafer made of flour and water with or without leavening and shortening; unsweetened or semisweet | - |
| (noun) a poor White person in the southern United States | Synonyms: redneck |
| (noun) a programmer who cracks (gains unauthorized access to) computers, typically to do malicious things | - |
| crackerberry | (noun) creeping perennial herb distinguished by red berries and clustered leaf whorls at the tips of shoots; Greenland to Alaska | Synonyms: bunchberry, Cornus canadensis, dwarf cornel, pudding berry |
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| crackerjack | (noun) something excellent of its kind | Synonyms: jimdandy, jimhickey |
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| (noun) someone excellent of their kind | Synonyms: jimdandy, jimhickey |
| crackers | (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, bonkers, buggy, cracked, daft, dotty, fruity, haywire, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
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| cracking | (adjective) excellent | Synonyms: bang-up, bully, corking, dandy, great, groovy, keen, neat, nifty, not bad, old, peachy, slap-up, smashing, swell |
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| (noun) the act of cracking something | Synonyms: crack, fracture |
| (noun) a sudden sharp noise | Synonyms: crack, snap |
| (noun) the process whereby heavy molecules of naphtha or petroleum are broken down into hydrocarbons of lower molecular weight (especially in the oil-refining process) | - |
| crackle | (adjective) having the surface decorated with a network of fine cracks, as in crackleware | - |
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| (noun) glazed china with a network of fine cracks on the surface | Synonyms: crackle china, crackleware |
| (noun) the sharp sound of snapping noises | Synonyms: crackling, crepitation |
| (verb) to become, or to cause to become, covered with a network of small cracks | - |
| (verb) make a crushing noise | Synonyms: crunch, scranch, scraunch |
| (verb) make a crackling sound | Synonyms: crepitate |
| crackleware | (noun) glazed china with a network of fine cracks on the surface | Synonyms: crackle, crackle china |
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| crackling | (noun) the sharp sound of snapping noises | Synonyms: crackle, crepitation |
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| (noun) the residue that remains after animal fat has been rendered | Synonyms: greaves |
| cracklings | (noun) the crisp residue left after lard has been rendered | - |
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| crackpot | (noun) a whimsically eccentric person | Synonyms: crank, fruitcake, nut, nut case, screwball |
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| cracksman | (noun) a thief who breaks open safes to steal valuable contents | Synonyms: safebreaker, safecracker |
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| crookback | (adjective) characteristic of or suffering from kyphosis, an abnormality of the vertebral column | Synonyms: crookbacked, gibbous, humpbacked, humped, hunchbacked, kyphotic |
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| (noun) a person whose back is hunched because of abnormal curvature of the upper spine | Synonyms: humpback, hunchback |