Blackjack
来自Big Physics
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wiktionary
blackjack ( countable and uncountable, plural blackjacks)
etymonline
blackjack (n.)
used in various senses since 16c., earliest is possibly "tar-coated leather jug for beer" (1590s), from black (adj.) + jack in any of its many slang meanings. From 1867 as "pirate flag." The hand-weapon so called from 1889; the card game by 1900.
