Main entry: twenty-one, blackjack, vingt-et-un
Definition: 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
Main entry: blackjack, black flag, Jolly Roger, pirate flag
Definition: a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship
Main entry: blackjack, sap, cosh
Definition: a piece of metal covered by leather with a flexible handle; used for hitting people
Main entry: Quercus marilandica, jack oak, blackjack, blackjack oak
Definition: 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
Main entry: pressure, blackjack, blackmail
Definition: exert pressure on someone through threats