1. 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
   - blackjack oak, jack oak, Quercus marilandica 
2. A piece of metal covered by leather with a flexible handle; used for hitting people
   - cosh, sap 
3. A flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship
   - black flag, pirate flag, Jolly Roger 
4. 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
   - twenty-one, vingt-et-un

1. Exert pressure on someone through threats
   - blackmail, pressure

Derived forms: blackjacks, blackjacking, blackjacked

Type of: act upon, bludgeon, card game, cards, flag, influence, scrub oak, work

Encyclopedia: Blackjack

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