blackjack (plural blackjacks)
- (card games) A common gambling card game in casinos, where the object is to get as close to 21 without going over.
- (card games) A hand in the game of blackjack consisting of a face card and an ace.
- 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).
- 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.
- Any of several species of weed of genus Bidens, such as Bidens pilosa, in the family Compositae.
- A blackjack oak.
- 1931, William Faulkner, Sanctuary, Library of America, 1985, p.20:
- A steep slope rose, crested by stunted blackjacks.
Flag traditionally flown by pirate ships
- French: pavillon de pirates m
blackjack (third-person singular simple present blackjacks, present participle blackjacking, simple past and past participle blackjacked)
- To strike with a blackjack or similar weapon.