Longman Dictionary of Contemporary English homepage

Topic: CARDS

Sense: 1
Date: 1900-2000
Origin: black + JACK12
Sense: 2
Date: 1800-1900
Origin: black + jack 'tool' (16-20 centuries)

blackjack

 noun
     
black‧jack
1 [uncountable]DGC a card game, usually played for money, in which you try to get as close to 21 points as possible
2 [countable] a weapon like a stick covered with leather, used to hit people
Definition of blackjack from the Longman Dictionary of Contemporary English within
the topic CARDS
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