Definitions from Wiktionary ( )

▸ noun:  (card games) A common gambling card game in casinos, where the object is to get as close to 21 without going over.
▸ noun:  (card games) A hand in the game of blackjack consisting of a face card and an ace.
▸ noun:  (card games) A variant of switch where each player is initially dealt the same number of cards, usually seven, and when one player plays a black jack the player whose turn comes next has to pick up that many cards, unless they play a red jack (as this normally cancels a black jack).
▸ noun:  (card games) A variant of hearts where the Jack of Spades is the penalty card.
▸ noun:  The flag (i.e., a jack) traditionally flown by pirate ships; popularly thought to be a white skull and crossed bones on a black field (the Jolly Roger).
▸ noun:  (weaponry) A small, flat, blunt, usually leather-covered weapon loaded with heavy material such as lead or ball bearings, intended to inflict a blow to the head that renders the victim unconscious with diminished risk of lasting cranial trauma.
▸ noun:  (aviation) A tool of leather filled with shot (or similar), resembling the weapon, used for shaping sheet metal.
▸ noun:  Any of several species of weed of genus Bidens, such as Bidens pilosa, in the family Compositae.
▸ noun:  Any of a series of hard, dark soils, often considered low quality, but suitable for growing certain crops such as cotton.
▸ noun:  (pharmacology, UK, Australia, rare) Ammonium bituminosulfonate.
▸ verb:  To strike with a blackjack or similar weapon.
▸ noun:  (fandom slang) A fan of the South Korean girl group 2NE1.
▸ noun:  Ellipsis of blackjack oak. [An oak tree of species Quercus marilandica.]

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