| crookbacked | (adjective) characteristic of or suffering from kyphosis, an abnormality of the vertebral column | Synonyms: crookback, gibbous, humpbacked, humped, hunchbacked, kyphotic |
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| crossjack | (noun) the lowermost sail on a mizzenmast | Synonyms: mizzen course |
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| cutback | (noun) a reduction in quantity or rate | - |
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| diamondback | (noun) large deadly rattlesnake with diamond-shaped markings | Synonyms: Crotalus adamanteus, diamondback rattlesnake |
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| dieback | (noun) a disease of plants characterized by the gradual dying of the young shoots starting at the tips and progressing to the larger branches | - |
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| drawback | (noun) the quality of being a hindrance | - |
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| fallback | (noun) to break off a military action with an enemy | Synonyms: disengagement, pullout |
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| fatback | (noun) salt pork from the back of a hog carcass | - |
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| feedback | (noun) response to an inquiry or experiment | - |
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| (noun) the process in which part of the output of a system is returned to its input in order to regulate its further output | - |
| finback | (noun) large flat-headed whalebone whale having deep furrows along the throat; of Atlantic and Pacific | Synonyms: Balaenoptera physalus, common rorqual, fin whale, finback whale |
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| firecracker | (noun) firework consisting of a small explosive charge and fuse in a heavy paper casing | Synonyms: banger, cracker |
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| flack | (noun) artillery designed to shoot upward at airplanes | Synonyms: ack-ack, ack-ack gun, antiaircraft, antiaircraft gun, flak, pom-pom |
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| (noun) intense adverse criticism | Synonyms: attack, blast, fire, flak |
| (noun) a slick spokesperson who can turn any criticism to the advantage of their employer | Synonyms: flack catcher, flak, flak catcher |
| flapjack | (noun) a flat cake of thin batter fried on both sides on a griddle | Synonyms: battercake, flannel-cake, flannel cake, flapcake, griddlecake, hot cake, hotcake, pancake |
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| flashback | (noun) a transition (in literary or theatrical works or films) to an earlier event or scene that interrupts the normal chronological development of the story | - |
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| (noun) an unexpected but vivid recurrence of a past experience (especially a recurrence of the effects of an hallucinogenic drug taken much earlier) | - |
| follback | (verb) to return someone's following of you on a social media platform | - |
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| fracking | (noun) a well-stimulation technique in which rock is fractured by a pressurized liquid | - |
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| fullback | (noun) (American football) the position of a back on a football team, generally larger in size than halfbacks | - |
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| (noun) (football) the running back who plays the fullback position on the offensive team | - |
| (verb) play the fullback | - |
| gimcrack | (adjective) tastelessly showy | Synonyms: brassy, cheap, flash, flashy, garish, gaudy, loud, meretricious, tacky, tatty, tawdry, trashy |
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| (noun) ornamental objects of no great value | Synonyms: falderol, folderal, frill, gimcrackery, nonsense, trumpery |
| gimcrackery | (noun) ornamental objects of no great value | Synonyms: falderol, folderal, frill, gimcrack, nonsense, trumpery |
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| gobsmacked | (adjective) utterly astounded | - |
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| grackle | (noun) long-tailed American blackbird having iridescent black plumage | Synonyms: crow blackbird |
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| (noun) glossy black Asiatic starling often taught to mimic speech | Synonyms: Gracula religiosa, hill myna, Indian grackle |
| grayback | (noun) a dowitcher with a grey back | Synonyms: greyback, Limnodromus griseus |
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| (noun) a sandpiper that breeds in the Arctic and winters in the Southern Hemisphere | Synonyms: Calidris canutus, greyback, knot |
| greenback | (noun) a piece of paper money (especially one issued by a central bank) | Synonyms: bank bill, bank note, banker's bill, banknote, bill, Federal Reserve note, government note, note |
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| greyback | (noun) a dowitcher with a grey back | Synonyms: grayback, Limnodromus griseus |
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| (noun) a sandpiper that breeds in the Arctic and winters in the Southern Hemisphere | Synonyms: Calidris canutus, grayback, knot |
| (noun) `Johnny' was applied as a nickname for Confederate soldiers by the Federal soldiers in the American Civil War; `greyback' derived from their grey Confederate uniforms | Synonyms: Johnny, Johnny Reb, Reb, Rebel |
| gripsack | (noun) a small suitcase | - |
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| gunnysack | (noun) a bag made of burlap | Synonyms: burlap bag, gunny sack |
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| hack | (noun) a horse kept for hire | - |
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| (noun) an old or over-worked horse | Synonyms: jade, nag, plug |
| (noun) a saddle horse used for transportation rather than sport etc. | - |
| (noun) a car driven by a person whose job is to take passengers where they want to go in exchange for money | Synonyms: cab, taxi, taxicab |
| (noun) a tool (as a hoe or pick or mattock) used for breaking up the surface of the soil | - |
| (noun) one who works hard at boring tasks | Synonyms: drudge, hacker |
| (noun) a mediocre and disdained writer | Synonyms: hack writer, literary hack |
| (noun) a politician who belongs to a small clique that controls a political party for private rather than public ends | Synonyms: machine politician, political hack, ward-heeler |
| (verb) cough spasmodically | Synonyms: whoop |
| (verb) significantly cut up a manuscript | Synonyms: cut up |
| (verb) fix a computer program piecemeal until it works | Synonyms: hack on |
| (verb) kick on the shins | - |
| (verb) kick on the arms | - |
| (verb) cut away | - |
| (verb) cut with a hacking tool | Synonyms: chop |
| (verb) be able to manage or manage successfully | Synonyms: cut |
| hackamore | (noun) rope or canvas headgear for a horse, with a rope for leading | Synonyms: halter |
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| hackathon | (noun) an event involving a marathon coding session | - |
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| hackberry | (noun) small edible dark purple to black berry with large pits; southern United States | Synonyms: sugarberry |
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| (noun) any of various trees of the genus Celtis having inconspicuous flowers and small berrylike fruits | Synonyms: nettle tree |
| hackbut | (noun) an obsolete firearm with a long barrel | Synonyms: arquebus, hagbut, harquebus |
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| hackee | (noun) small striped semiterrestrial eastern American squirrel with cheek pouches | Synonyms: eastern chipmunk, ground squirrel, striped squirrel, Tamias striatus |
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| hacker | (noun) one who works hard at boring tasks | Synonyms: drudge, hack |
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| (noun) a programmer for whom computing is its own reward; may enjoy the challenge of breaking into other computers but does no harm | - |
| (noun) someone who plays golf poorly | - |
| hackle | (noun) long slender feather on the necks of e.g. turkeys and pheasants | - |
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| (verb) comb with a heckle | Synonyms: hatchel, heckle |
| hackles | (noun) a feeling of anger and animosity | Synonyms: dander |
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| hackmatack | (noun) poplar of northeastern North America with broad heart-shaped leaves | Synonyms: balsam poplar, Populus balsamifera, tacamahac |
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| hackney | (noun) a compact breed of harness horse | - |
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| (noun) a carriage for hire | Synonyms: hackney carriage, hackney coach |
| hackneyed | (adjective) repeated too often; overfamiliar through overuse | Synonyms: banal, commonplace, old-hat, shopworn, stock, threadbare, timeworn, tired, trite, well-worn |
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| hacksaw | (noun) saw used with one hand for cutting metal | Synonyms: hack saw, metal saw |
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| hackwork | (noun) professional work done according to formula | - |
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| (noun) (Literary & Literary Critical Terms) undistinguished literary work produced to order. | - |
| halfback | (noun) (American football) the position of a back on a football team, generally smaller in size than a fullback | - |
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| (noun) (football) the running back who plays the offensive halfback position | - |
| hardback | (adjective) having a hard back or cover | Synonyms: hardbacked, hardbound, hardcover |
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| (noun) a book with cardboard or cloth or leather covers | Synonyms: hardcover |
| hardbacked | (adjective) having a hard back or cover | Synonyms: hardback, hardbound, hardcover |
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| hardtack | (noun) very hard unsalted biscuit or bread; a former ship's staple | Synonyms: pilot biscuit, pilot bread, sea biscuit, ship biscuit |
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| (noun) a mountain mahogany | - |
| hatchback | (noun) a sloping rear car door that is lifted to open | Synonyms: hatch, hatchback door, liftgate |
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| (noun) a car having a hatchback door | - |
| hatrack | (noun) a rack with hooks for temporarily holding coats and hats | Synonyms: coat rack, coatrack |
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| haversack | (noun) a bag carried by a strap on your back or shoulder | Synonyms: back pack, backpack, knapsack, packsack, rucksack |
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| hayrack | (noun) a frame attached to a wagon to increase the amount of hay it can carry | Synonyms: hayrig |
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| (noun) a rack that holds hay for feeding livestock | - |
| haystack | (noun) a stack of hay | Synonyms: hayrick, rick |
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| highjack | (noun) seizure of a vehicle in transit either to rob it or divert it to an alternate destination | Synonyms: hijack |
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| (verb) take arbitrarily or by force | Synonyms: commandeer, hijack, pirate |
| highjacker | (noun) a holdup man who stops a vehicle and steals from it | Synonyms: highwayman, hijacker, road agent |
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| (noun) someone who uses force to take over a vehicle (especially an airplane) in order to reach an alternative destination | Synonyms: hijacker |
| highjacking | (noun) robbery of a traveller or vehicle in transit or seizing control of a vehicle by the use of force | Synonyms: hijacking |
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| hijack | (noun) seizure of a vehicle in transit either to rob it or divert it to an alternate destination | Synonyms: highjack |
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| (verb) take arbitrarily or by force | Synonyms: commandeer, highjack, pirate |
| (verb) seize control of | - |
| hijacker | (noun) a holdup man who stops a vehicle and steals from it | Synonyms: highjacker, highwayman, road agent |
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| (noun) someone who uses force to take over a vehicle (especially an airplane) in order to reach an alternative destination | Synonyms: highjacker |
| hijacking | (noun) robbery of a traveller or vehicle in transit or seizing control of a vehicle by the use of force | Synonyms: highjacking |
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| hitchrack | (noun) a fixed horizontal rail to which a horse can be hitched to prevent it from straying | Synonyms: hitching bar |
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| hogback | (noun) a narrow ridge of hills | Synonyms: horseback |
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| hopsack | (noun) a loosely woven coarse fabric of cotton or linen; used in clothing | Synonyms: hopsacking |
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| hopsacking | (noun) a loosely woven coarse fabric of cotton or linen; used in clothing | Synonyms: hopsack |
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| horseback | (noun) the back of a horse | - |
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| (noun) a narrow ridge of hills | Synonyms: hogback |
| (adverb) on the back of a horse | Synonyms: ahorse, ahorseback |
| huckaback | (noun) toweling consisting of coarse absorbent cotton or linen fabric | Synonyms: huck |
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| humpback | (noun) large whalebone whale with long flippers noted for arching or humping its back as it dives | Synonyms: humpback whale, Megaptera novaeangliae |
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| (noun) a person whose back is hunched because of abnormal curvature of the upper spine | Synonyms: crookback, hunchback |
| (noun) an abnormal backward curve to the vertebral column | Synonyms: hunchback, kyphosis |
| humpbacked | (adjective) characteristic of or suffering from kyphosis, an abnormality of the vertebral column | Synonyms: crookback, crookbacked, gibbous, humped, hunchbacked, kyphotic |
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| hunchback | (noun) a person whose back is hunched because of abnormal curvature of the upper spine | Synonyms: crookback, humpback |
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| (noun) an abnormal backward curve to the vertebral column | Synonyms: humpback, kyphosis |
| hunchbacked | (adjective) characteristic of or suffering from kyphosis, an abnormality of the vertebral column | Synonyms: crookback, crookbacked, gibbous, humpbacked, humped, kyphotic |
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| hydrocracking | (noun) the process whereby hydrocarbon molecules of petroleum are broken down into kerosene and gasolene by the addition of hydrogen under high pressure in the presence of a catalyst | - |
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| jack | (noun) any of several fast-swimming predacious fishes of tropical to warm temperate seas | - |
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| (noun) male donkey | Synonyms: jackass |
| (noun) tool for exerting pressure or lifting | - |
| (noun) one of four face cards in a deck bearing a picture of a young prince | Synonyms: knave |
| (noun) small flag indicating a ship's nationality | - |
| (noun) game equipment consisting of one of several small six-pointed metal pieces that are picked up while bouncing a ball in the game of jacks | Synonyms: jackstones |
| (noun) an electrical device consisting of a connector socket designed for the insertion of a plug | - |
| (noun) a small ball at which players aim in lawn bowling | - |
| (noun) immense East Indian fruit resembling breadfruit; it contains an edible pulp and nutritious seeds that are commonly roasted | Synonyms: jackfruit, jak |
| (noun) someone who works with their hands; someone engaged in manual labor | Synonyms: laborer, labourer, manual laborer |
| (noun) a small worthless amount | Synonyms: diddley, diddly-shit, diddly-squat, diddly, diddlyshit, diddlysquat, doodly-squat, shit, squat |
| (verb) hunt with a jacklight | Synonyms: jacklight |
| (verb) lift with a special device | Synonyms: jack up |
| jackal | (noun) Old World nocturnal canine mammal closely related to the dog; smaller than a wolf; sometimes hunts in a pack but usually singly or as a member of a pair | - |
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| (noun) a jackal native to Europe and Asia with a golden coat | Synonyms: Canis aureus, golden jackal |
| (noun) a jackal native to Africa with a black back | Synonyms: black-backed jackal, Canis mesomelas |
| (noun) a jackal native to Southern Africa with a stripe down its side | Synonyms: Canis adustus, side-striped jackal |
| (noun) a canid living in the deserts of Northern Africa related to the goldn jackal and the grey wolf | Synonyms: African golden wolf, Canis anthus, Egyptian jackal, grey jackal |
| jackanapes | (noun) someone who is unimportant but cheeky and presumptuous | Synonyms: lightweight, whippersnapper |
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| jackass | (noun) male donkey | Synonyms: jack |
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| (noun) a man who is a stupid incompetent fool | Synonyms: bozo, cuckoo, fathead, goof, goofball, goose, twat, zany |
| jackboot | (noun) (19th century) a man's high tasseled boot | Synonyms: hessian, Hessian boot, Wellington, Wellington boot |
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| jackdaw | (noun) common black-and-grey Eurasian bird noted for thievery | Synonyms: Corvus monedula, daw |
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| jacket | (noun) a short coat | - |
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| (noun) an outer wrapping or casing | - |
| (noun) (dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth | Synonyms: cap, crown, crownwork, jacket crown |
| (noun) the tough metal shell casing for certain kinds of ammunition | - |
| (noun) the outer skin of a potato | - |
| (verb) put a jacket on | - |
| (verb) provide with a thermally non-conducting cover | - |
| jackfruit | (noun) immense East Indian fruit resembling breadfruit; it contains an edible pulp and nutritious seeds that are commonly roasted | Synonyms: jack, jak |
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| (noun) East Indian tree cultivated for its immense edible fruit and seeds | Synonyms: Artocarpus heterophyllus, jackfruit tree |
| jackhammer | (noun) a hammer driven by compressed air | Synonyms: air hammer, pneumatic hammer |
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| jackknife | (noun) a dive in which the diver bends to touch the ankles before straightening out | - |
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| (noun) a large knife with one or more folding blades | Synonyms: clasp knife |
| (verb) dive into the water bending the body at the waist at a right angle, like a jackknife | - |
| jacklight | (noun) a light used as a lure in hunting or fishing at night | - |
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| (verb) hunt with a jacklight | Synonyms: jack |
| jackpot | (noun) the cumulative amount involved in a game (such as poker) | Synonyms: kitty, pot |
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| (noun) any outstanding award | - |
| jackrabbit | (noun) large hare of western North America | - |
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| (verb) go forward or start with a fast, sudden movement | - |
| jacks | (noun) a game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball | Synonyms: jackstones, knucklebones |
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| jackscrew | (noun) screw-operated jack | Synonyms: screw jack |
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| jacksmelt | (noun) a relatively large silversides of the Pacific coast of North America (known to reach 18 inches in length) | Synonyms: Atherinopsis californiensis |
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| jacksnipe | (noun) American sandpiper that inflates its chest when courting | Synonyms: Calidris melanotos, pectoral sandpiper |
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| (noun) a small short-billed Old World snipe | Synonyms: half snipe, Limnocryptes minima |
| jackstones | (noun) a game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball | Synonyms: jacks, knucklebones |
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| (noun) game equipment consisting of one of several small six-pointed metal pieces that are picked up while bouncing a ball in the game of jacks | Synonyms: jack |
| jackstraw | (noun) a thin strip of wood used in playing the game of jackstraws | Synonyms: spillikin |
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| jackstraws | (noun) a game in which players try to pick each jackstraw (or spillikin) off of a pile without moving any of the others | Synonyms: spillikins |
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| jampack | (verb) crowd or pack to capacity | Synonyms: chock up, cram, jam, ram, wad |
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| kickback | (noun) a commercial bribe paid by a seller to a purchasing agent in order to induce the agent to enter into the transaction | - |
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| knack | (noun) a special way of doing something | Synonyms: bent, hang |
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| knacker | (noun) someone who buys up old horses for slaughter | - |
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| (noun) someone who buys old buildings or ships and breaks them up to recover the materials in them | - |
| knackered | (adjective) extremely exhausted | Synonyms: drained |
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| knackwurst | (noun) short thick highly seasoned sausage | Synonyms: knockwurst |
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| knapsack | (noun) a bag carried by a strap on your back or shoulder | Synonyms: back pack, backpack, haversack, packsack, rucksack |
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| knickknack | (noun) miscellaneous curios | Synonyms: bric-a-brac, knickknackery, nicknack, whatnot |
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| (noun) a small inexpensive mass-produced article | Synonyms: novelty |
| knickknackery | (noun) miscellaneous curios | Synonyms: bric-a-brac, knickknack, nicknack, whatnot |
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| lack | (noun) the state of needing something that is absent or unavailable | Synonyms: deficiency, want |
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| (verb) be without | Synonyms: miss |
| (verb) To be insufficiently prepared | - |
| lackadaisical | (adjective) idle or indolent especially in a dreamy way | - |
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| (adjective) lacking spirit or liveliness | Synonyms: dreamy, languid, languorous |
| lackadaisically | (adverb) in an idle and lackadaisical manner | - |
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| lackey | (noun) a male servant (especially a footman) | Synonyms: flunkey, flunky |
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| (noun) a person who tries to please someone in order to gain a personal advantage | Synonyms: ass-kisser, crawler, sycophant, toady |
| lacking | (adjective) inadequate in amount or degree | Synonyms: deficient, wanting |
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| (adjective) nonexistent | Synonyms: absent, missing, wanting |