A blackjack is a short, thick stick that is used as a weapon. [US, informal] Police confiscated guns, knives and blackjacks. regional note: in BRIT, use truncheon.
All cards are at face value, except for the King, Queen and Jack which count as 10. An Ace will have a value of 11 unless that would give a player or the dealer a score in excess of 21; in which case, it has a value of 1. The dealer starts the game.