| amberjack | (noun) any of several amber to coppery fork-tailed warm-water carangid fishes | Synonyms: amberfish |
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| applejack | (noun) distilled from hard cider | - |
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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 |
| bootjack | (noun) has V-shaped notch for pulling off boots | - |
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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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| cheapjack | (adjective) made of inferior workmanship and materials | Synonyms: shoddy, tawdry |
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| (noun) a peddler of inferior goods | - |
| crackerjack | (noun) something excellent of its kind | Synonyms: jimdandy, jimhickey |
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| (noun) someone excellent of their kind | Synonyms: jimdandy, jimhickey |
| crossjack | (noun) the lowermost sail on a mizzenmast | Synonyms: mizzen course |
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| 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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| 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 |
| 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 | - |
| 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 |
| leatherjack | (noun) any of several New World tropical fishes having tiny embedded scales | Synonyms: leatherjacket |
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| lumberjack | (noun) a short warm outer jacket | Synonyms: lumber jacket |
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| (noun) a person who fells trees | Synonyms: faller, feller, logger, lumberman |
| natterjack | (noun) common brownish-yellow short-legged toad of western Europe; runs rather than hops | Synonyms: Bufo calamita |
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| skipjack | (noun) oceanic schooling tuna of considerable value in Pacific but less in Atlantic; reaches 75 pounds; very similar to if not the same as oceanic bonito | Synonyms: Euthynnus pelamis, skipjack tuna |
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| (noun) medium-sized tuna-like food fish of warm Atlantic and Pacific waters; less valued than tuna | Synonyms: Atlantic bonito, Sarda sarda |
| (noun) able to right itself when on its back by flipping into the air with a clicking sound | Synonyms: click beetle, snapping beetle |
| skyjack | (verb) subject an aircraft to air piracy | - |
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| steeplejack | (noun) someone who builds or maintains very tall structures | - |
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| supplejack | (noun) walking stick made from the wood of an American tropical vine | - |
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