1. (noun) blackjack oak, blackjack, jack oak, Quercus marilandica
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: northern pin oak, sap, black flag, blackjack, vingt-et-un, pirate flag, twenty-one, cosh, blackjack oak, jack oak
2. (noun) blackjack, cosh, sap
a piece of metal covered by leather with a flexible handle; used for hitting people
Synonyms: sap, black flag, fool, saphead, jack oak, blackjack, vingt-et-un, muggins, pirate flag, tomfool, twenty-one, cosh, blackjack oak
3. (noun) black flag, pirate flag, Jolly Roger, blackjack
a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship
Synonyms: cosh, black flag, sap, blackjack, vingt-et-un, pirate flag, twenty-one, blackjack oak, jack oak
4. (verb) blackjack, twenty-one, vingt-et-un
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: sap, black flag, jack oak, blackjack, vingt-et-un, pirate flag, twenty-one, cosh, blackjack oak
5. (verb) blackmail, blackjack, pressure
exert pressure on someone through threats
Synonyms: blackmail, hale, pressure, coerce, blackjack, force, squeeze
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Synonyms for blackjack 
