black jack

• n.
  • 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

    同义词： blackjack oak blackjack jack oak Quercus marilandica

  • a piece of metal covered by leather with a flexible handle; used for hitting people

    同义词： blackjack cosh sap

  • a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship

    同义词： black flag pirate flag Jolly Roger blackjack

  • a gambling game using cards; the object is to hold cards having a higher count than those dealt to the bank up to but not exceeding 21

    同义词： blackjack twenty-one vingt-et-un

• v. exert pressure on someone through threats

  同义词： blackmail blackjack pressure

以上来源于: WordNet