black·jack 
/ˈblækˌʤæk/ noun
plural black·jacks /ˈblækˌʤæk/ noun 1 [noncount] : a card game in which the players try to get a score that is higher than that of the dealer but less than or equal to 21 — often used before another noun ▪ a blackjack table [=a table at which blackjack is played in a casino] —called also (US) twenty-one 2 [count] : a small leather-covered metal club used as a hand weapon
