| airfare | (noun) the fare charged for traveling by airplane | - |
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| airfield | (noun) a place where planes take off and land | Synonyms: field, flying field, landing field |
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| airflow | (noun) the flow of air | Synonyms: air flow, flow of air |
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| airfoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: aerofoil, control surface, surface |
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| airforce | (noun) the airborne branch of a country's armed forces | Synonyms: air force |
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| airframe | (noun) the framework and covering of an airplane or rocket (excluding the engines) | - |
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| airfreight | (verb) transport (cargo) by air | Synonyms: air-freight, air-ship |
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| alderfly | (noun) dark-colored insect having predaceous aquatic larvae | Synonyms: alder fly, Sialis lutaria |
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| alligatorfish | (noun) small very elongate sea poachers | Synonyms: Aspidophoroides monopterygius |
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| amberfish | (noun) any of several amber to coppery fork-tailed warm-water carangid fishes | Synonyms: amberjack |
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| anglerfish | (noun) fishes having large mouths with a wormlike filament attached for luring prey | Synonyms: allmouth, angler, angler fish, goosefish, Lophius Americanus, lotte, monkfish |
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| archerfish | (noun) any of several small freshwater fishes that catch insects by squirting water at them and knocking them into the water; found in Indonesia and Australia | Synonyms: Toxotes jaculatrix |
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| barf | (noun) the matter ejected in vomiting | Synonyms: puke, vomit, vomitus |
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| (verb) eject the contents of the stomach through the mouth | Synonyms: be sick, cast, cat, chuck, disgorge, honk, puke, purge, regorge, regurgitate, retch, sick, spew, spue, throw up, upchuck, vomit, vomit up |
| boarfish | (noun) fish with a projecting snout | Synonyms: Capros aper |
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| (noun) fish with large eyes and long snouts | - |
| buckminsterfullerene | (noun) a spheroidal fullerene; the first known example of a fullerene | Synonyms: buckyball |
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| burrfish | (noun) any of several fishes having rigid flattened spines | - |
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| butterfat | (noun) the fatty substance of milk from which butter is made | - |
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| butterfingered | (adjective) lacking physical movement skills, especially with the hands | Synonyms: bumbling, bungling, ham-fisted, ham-handed, handless, heavy-handed, left-handed |
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| butterfingers | (noun) someone who drops things (especially one who cannot catch a ball) | - |
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| butterfish | (noun) small marine fish with a short compressed body and feeble spines | Synonyms: stromateid, stromateid fish |
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| (noun) slippery scaleless food fish of the northern Atlantic coastal waters | Synonyms: Pholis gunnellus, rock gunnel |
| (noun) any of numerous small flat Atlantic food fish having smooth skin | - |
| butterflower | (noun) any of various plants of the genus Ranunculus | Synonyms: butter-flower, buttercup, crowfoot, goldcup, kingcup |
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| butterfly | (noun) a swimming stroke in which the arms are thrown forward together out of the water while the feet kick up and down | Synonyms: butterfly stroke |
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| (noun) diurnal insect typically having a slender body with knobbed antennae and broad colorful wings | - |
| (verb) talk or behave amorously, without serious intentions | Synonyms: chat up, coquet, coquette, dally, flirt, mash, philander, romance |
| (verb) cut and spread open, as in preparation for cooking | - |
| (verb) flutter like a butterfly | - |
| butterflyfish | (noun) tropical fish with huge fanlike pectoral fins for underwater gliding; unrelated to searobins | Synonyms: flying gurnard, flying robin |
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| carfare | (noun) the fare charged for riding a bus or streetcar | Synonyms: bus fare |
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| carful | (noun) the quantity that a car will hold | - |
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| centerfield | (noun) the fielding position of the player on a baseball team who is expected to field balls in the central third of the outfield | Synonyms: center field |
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| (noun) the piece of ground in the outfield directly ahead of the catcher | Synonyms: center, center field, centre |
| centerfielder | (noun) the person who plays center field | Synonyms: center fielder |
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| centerfold | (noun) a magazine center spread; especially a foldout of a large photograph or map or other feature | Synonyms: centrefold |
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| cheerful | (adjective) being full of or promoting cheer; having or showing good spirits | - |
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| (adjective) pleasantly (even unrealistically) optimistic | Synonyms: pollyannaish, upbeat |
| cheerfully | (adverb) in a cheerful manner | - |
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| cheerfulness | (noun) the quality of being cheerful and dispelling gloom | Synonyms: cheer, sunniness, sunshine |
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| (noun) a feeling of spontaneous good spirits | Synonyms: blitheness |
| chesterfield | (noun) a fitted overcoat with a velvet collar | - |
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| (noun) an overstuffed davenport with upright armrests | - |
| chiggerflower | (noun) erect perennial of eastern and southern United States having showy orange flowers | Synonyms: Asclepias tuberosa, butterfly weed, chigger flower, Indian paintbrush, orange milkweed, pleurisy root, tuber root |
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| cigarfish | (noun) small fusiform fish of western Atlantic | Synonyms: Decapterus punctatus, quiaquia, round scad |
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| clusterfuck | (noun) A chaotic situation where everything seems to go wrong | - |
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| colorfast | (adjective) having color that is resistant to fading or running | - |
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| colorful | (adjective) having much or varied color | Synonyms: colourful |
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| (adjective) having color or a certain color; sometimes used in combination | Synonyms: colored, coloured, colourful |
| (adjective) striking in variety and interest | Synonyms: colourful |
| colourful | (adjective) having much or varied color | Synonyms: colorful |
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| (adjective) striking in variety and interest | Synonyms: colorful |
| (adjective) having color or a certain color; sometimes used in combination | Synonyms: colored, colorful, coloured |
| containerful | (noun) the quantity that a container will hold | - |
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| counterfactual | (adjective) going counter to the facts (usually as a hypothesis) | Synonyms: contrary to fact |
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| counterfactuality | (noun) the quality of being contrary to fact | - |
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| counterfeit | (adjective) not genuine; imitating something superior | Synonyms: imitative |
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| (noun) a copy that is represented as the original | Synonyms: forgery |
| (verb) make a copy of with the intent to deceive | Synonyms: fake, forge |
| counterfeiter | (noun) someone who makes copies illegally | Synonyms: forger |
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| counterfire | (noun) fire intended to neutralize or destroy enemy weapons | - |
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| counterfoil | (noun) the part of a check that is retained as a record | Synonyms: check stub, stub |
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| curfew | (noun) a signal (usually a bell) announcing the start of curfew restrictions | - |
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| (noun) an order that after a specific time certain activities (as being outside on the streets) are prohibited | - |
| (noun) the time that the curfew signal is sounded | - |
| doctorfish | (noun) surgeon fish of the West Indies | Synonyms: Acanthurus chirurgus, doctor-fish |
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| dollarfish | (noun) small food fish of Atlantic coast | Synonyms: Poronotus triacanthus |
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| (noun) any of several silvery marine fishes with very flat bodies | Synonyms: Atlantic moonfish, horse-head, horsefish, horsehead, moonfish, Selene setapinnis |
| doorframe | (noun) the frame that supports a door | Synonyms: doorcase |
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| dwarf | (noun) a plant or animal that is atypically small | - |
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| (noun) a person who is markedly small | Synonyms: midget, nanus |
| (noun) a legendary creature resembling a tiny old man; lives in the depths of the earth and guards buried treasure | Synonyms: gnome |
| (verb) check the growth of | - |
| (verb) make appear small by comparison | Synonyms: overshadow, shadow |
| dwarfish | (adjective) atypically small | - |
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| dwarfishness | (noun) the quality of being built like a dwarf | - |
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| dwarfism | (noun) a genetic abnormality resulting in short stature | Synonyms: nanism |
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| earflap | (noun) one of two flaps attached to a cap to keep the ears warm | Synonyms: earlap |
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| earful | (noun) a severe scolding | Synonyms: bawling out, castigation, chewing out, dressing down, going-over, upbraiding |
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| (noun) an outpouring of gossip | - |
| farfalle | (noun) pasta shaped with scalloped edges and pinched in the middle, suggestive of a bow tie | Synonyms: bowtie pasta |
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| farfetched | (adjective) (of an idea or story) so exaggerated or ludicrous as to be improbable | Synonyms: far-fetched |
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| (adjective) (of a theory or explanation) highly imaginative but unlikely and unconvincing | Synonyms: far-fetched |
| fearful | (adjective) lacking courage; ignobly timid and faint-hearted | Synonyms: cowardly |
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| (adjective) experiencing or showing fear | - |
| (adjective) causing fear or dread or terror | Synonyms: awful, dire, direful, dread, dreaded, dreadful, fearsome, frightening, horrendous, horrific, terrible |
| (adjective) extremely distressing | Synonyms: frightful |
| (adjective) timid by nature or revealing timidity | Synonyms: timorous, trepid |
| fearfully | (adverb) in fear | - |
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| (adverb) in an alarming manner | - |
| fearfulness | (noun) the trait of being afraid | - |
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| (noun) an emotion experienced in anticipation of some specific pain or danger (usually accompanied by a desire to flee or fight) | Synonyms: fear, fright |
| featherfoil | (noun) a plant of the genus Hottonia | Synonyms: feather-foil |
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| feverfew | (noun) bushy aromatic European perennial herb having clusters of buttonlike white-rayed flower heads; valued traditionally for medicinal uses; sometimes placed in genus Chrysanthemum | Synonyms: Chrysanthemum parthenium, Tanacetum parthenium |
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| fingerflower | (noun) tall leafy European biennial or perennial having spectacular clusters of large tubular pink-purple flowers; leaves yield drug digitalis and are poisonous to livestock | Synonyms: common foxglove, Digitalis purpurea, fairy bell, finger-flower, finger-root, fingerroot |
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| flavorful | (adjective) full of flavor | Synonyms: flavorous, flavorsome, flavourful, flavourous, flavoursome, sapid, saporous |
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| flavourful | (adjective) full of flavor | Synonyms: flavorful, flavorous, flavorsome, flavourous, flavoursome, sapid, saporous |
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| forfeit | (adjective) surrendered as a penalty | Synonyms: confiscate, forfeited |
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| (noun) the act of losing or surrendering something as a penalty for a mistake or fault or failure to perform etc. | Synonyms: forfeiture, sacrifice |
| (noun) a penalty for a fault or mistake that involves losing or giving up something | Synonyms: forfeiture |
| (noun) something that is lost or surrendered as a penalty | Synonyms: forfeiture |
| (verb) lose (something) or lose the right to (something) by some error, offense, or crime | Synonyms: forego, forgo, give up, throw overboard, waive |
| forfeited | (adjective) surrendered as a penalty | Synonyms: confiscate, forfeit |
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| forfeiture | (noun) the act of losing or surrendering something as a penalty for a mistake or fault or failure to perform etc. | Synonyms: forfeit, sacrifice |
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| (noun) a penalty for a fault or mistake that involves losing or giving up something | Synonyms: forfeit |
| (noun) something that is lost or surrendered as a penalty | Synonyms: forfeit |
| forfend | (verb) prevent the occurrence of; prevent from happening; to protect from or to keep away anything undesirable; to ward off | Synonyms: avert, avoid, debar, deflect, fend off, forefend, head off, obviate, stave off, ward off |
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| forficate | (adjective) resembling a fork; divided or separated into two branches | Synonyms: bifurcate, biramous, branched, fork-like, forked, pronged, prongy |
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| fourfold | (adjective) having four units or components | Synonyms: four-fold, quadruple, quadruplex, quadruplicate |
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| (adjective) four times as great or many | Synonyms: four-fold, quadruple |
| (adverb) by a factor of four | Synonyms: four times |
| furfural | (noun) a liquid aldehyde with a penetrating odor; made from plant hulls and corncobs; used in making furan and as a solvent | Synonyms: furfuraldehyde |
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| furfuraldehyde | (noun) a liquid aldehyde with a penetrating odor; made from plant hulls and corncobs; used in making furan and as a solvent | Synonyms: furfural |
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| furfuran | (noun) a colorless toxic flammable liquid used in the synthesis of nylon | Synonyms: furan, furane |
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| garfish | (noun) primitive predaceous North American fish covered with hard scales and having long jaws with needlelike teeth | Synonyms: billfish, gar, garpike, Lepisosteus osseus |
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| gerfalcon | (noun) large and rare Arctic falcon having white and dark color phases | Synonyms: Falco rusticolus, gyrfalcon |
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| guitarfish | (noun) primitive tropical bottom-dwelling ray with a guitar-shaped body | - |
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| gyrfalcon | (noun) large and rare Arctic falcon having white and dark color phases | Synonyms: Falco rusticolus, gerfalcon |
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| headscarf | (noun) a kerchief worn over the head and tied under the chin | - |
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| hoarfrost | (noun) ice crystals forming a white deposit (especially on objects outside) | Synonyms: frost, hoar, rime |
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| hyperfine | (adjective) extremely fine or thin, as in a spectral line split into two or more components | - |
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| imperfect | (adjective) not perfect; defective or inadequate | - |
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| (adjective) wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings | Synonyms: fallible, frail, weak |
| (noun) a tense of verbs used in describing action that is on-going | Synonyms: continuous tense, imperfect tense, progressive, progressive tense |
| imperfectibility | (noun) the capability of becoming imperfect | - |
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| imperfectible | (adjective) capable of being made imperfect | - |
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| imperfection | (noun) the state or an instance of being imperfect | Synonyms: imperfectness |
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| imperfective | (noun) aspect without regard to the beginning or completion of the action of the verb | Synonyms: imperfective aspect |
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| imperfectly | (adverb) in an imperfect or faulty way | Synonyms: amiss |
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| imperfectness | (noun) the state or an instance of being imperfect | Synonyms: imperfection |
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| imperforate | (adjective) not perforated; having no opening | - |
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| interface | (noun) (chemistry) a surface forming a common boundary between two things (two objects or liquids or chemical phases) | - |
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| (noun) (computer science) computer circuit consisting of the hardware and associated circuitry that links one device with another (especially a computer and a hard disk drive or other peripherals) | Synonyms: port |
| (noun) the overlap where two theories or phenomena affect each other or have links with each other | - |
| (noun) (computer science) a program that controls a display for the user (usually on a computer monitor) and that allows the user to interact with the system | Synonyms: user interface |
| interfacial | (adjective) relating to or situated at an interface | - |
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| interfaith | (adjective) involving persons of different religious faiths | - |
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| interfere | (verb) get involved, so as to alter or hinder an action, or through force or threat of force | Synonyms: interpose, intervene, step in |
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| (verb) come between so as to be hindrance or obstacle | - |
| interference | (noun) the act of hindering or obstructing or impeding | Synonyms: hinderance, hindrance |
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| (noun) (American football) blocking a player's path with your body | - |
| (noun) any obstruction that impedes or is burdensome | Synonyms: encumbrance, hinderance, hindrance, hitch, incumbrance, preventative, preventive |
| (noun) a policy of intervening in the affairs of other countries | Synonyms: intervention |
| (noun) electrical or acoustic activity that can disturb communication | Synonyms: disturbance, noise |
| interfering | (adjective) intrusive in a meddling or offensive manner | Synonyms: busy, busybodied, meddlesome, meddling, officious |
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| interferometer | (noun) any measuring instrument that uses interference patterns to make accurate measurements of waves | - |
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| interferon | (noun) an antiviral protein produced by cells that have been invaded by a virus; inhibits replication of the virus | - |
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| interfixation | (noun) derivation of a new word by inserting an interfix between two morphemes. | - |
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| jarful | (noun) the quantity contained in a jar | Synonyms: jar |
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| kerfuffle | (noun) a disorderly outburst or tumult | Synonyms: commotion, disruption, disturbance, flutter, hoo-ha, hoo-hah, hurly burly, to-do |
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