Definition of 'blackjack'

Noun

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
      Synonyms: blackjack oak jack oak Quercus marilandica
2. a piece of metal covered by leather with a flexible handle; used for hitting people
      Synonyms: cosh sap
3. a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship
      Synonyms: 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 bank up to but not exceeding 21
      Synonyms: twenty-one vingt-et-un

Verb

1. exert pressure on someone through threats
      Synonyms: blackmail pressure

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