- blackjack (n.)
[blackjack 词源字典]
- used in many senses since 16c., earliest is possibly "tar-coated leather jug for beer" (1590s), from black (adj.) + jack in any of its many slang senses. The weapon so called from 1889; the card game by 1900.[blackjack etymology, blackjack origin, 英语词源]