blackjack Definition

blackjack
noun

1a. cards.
Pontoon² or a similar game;
1b. cards.
A combination of an ace and a face-card in the game of blackjack.
(N Amer)
2. A length of hard flexible leather, especially one used for hitting people; a cosh.
3. antiq.
A large jug or tankard for holding drink, made of tarred leather.

verb blackjacked, blackjacking

1. To hit someone with a blackjack (sense 2).
2. To pressurize or threaten someone into doing something.

Etymology: 16c in sense 3.