blackjack

1. (card games) A common gambling card game in casinos, where the object is to get as close to 21 without going over.Synonyms: pontoon, twenty-one, vingt-et-uncountableuncountable

2. (card games) A hand in the game of blackjack consisting of a face card and an ace.countableuncountable

3. (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).countableuncountable

4. (card games) A variant of hearts where the Jack of Spades is the penalty card.countableuncountable

5. (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.Examples: "The pain is sometimes like the dull, heavy thud of being hit with a lead-filled blackjack; other times like a wizard is reaching deep below the skin and ripping muscles, tendons, and nerves."countableuncountable

6. (aviation) A tool of leather filled with shot (or similar), resembling the weapon, used for shaping sheet metal.countableuncountable