WordReference Random House Learner's Dictionary of American English © 2019
black•jack /ˈblækˌdʒæk/USA pronunciation   n. 
  1. [countable] a short, leather-covered club, made of a heavy head on a flexible handle and used as a weapon.
  2. Games[uncountable]
    • Also called ˈtwen•ty-ˈone. a gambling game of cards, in which a player needs to get more points than the dealer to win, but not more than 21:They played blackjack at the casino.
    • an ace together with a ten or a face card drawn as the first two cards dealt in a hand of this game:got blackjack three times in a row!

WordReference Random House Unabridged Dictionary of American English © 2019
black•jack  (blakjak′),USA pronunciation n. 
  1. a short, leather-covered club, consisting of a heavy head on a flexible handle, used as a weapon.
  2. [Cards.]
    • twenty-one (def. 4).
    • Also called  natural. (in twenty-one) an ace together with a ten or a face card as the first two cards dealt.
    • a variety of twenty-one in which any player can become dealer.
  3. See  black flag (defs. 1, 2).
  4. a small oak, Quercus marilandica, of the eastern U.S., having a nearly black bark and a wood of little value except for fuel.
  5. a large drinking cup or jug for beer, ale, etc., originally made of leather coated externally with tar. Cf. bombard (def. 7).
  6. caramel or burnt sugar for coloring spirits, vinegar, coffee, etc.
  7. [Mineral.]a dark, iron-rich variety of sphalerite.

v.t. 
  1. to strike or beat with a blackjack.
  2. to compel by threat.
  • black + jack1 1505–15


Collins Concise English Dictionary © HarperCollins Publishers::

blackjack /ˈblækˌdʒæk/ chiefly US Canadian n
  1. a truncheon of leather-covered lead with a flexible shaft
vb
  1. (transitive) to hit with or as if with a blackjack
  2. (transitive) to compel (a person) by threats
Etymology: 19th Century: from black + jack1 (implement)
blackjack /ˈblækˌdʒæk/ n
  1. pontoon or any of various similar card games
Etymology: 20th Century: from black + jack1 (the knave)



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