trump card

Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++trump card1 → trump/best/strongest card at card1(8) something that gives you a big advantage in a particular situation2 → trump card at trump1(2) something that you can do or use in a situation, which gives you an advantage

trump card

BrE

/ˈtrʌmp kɑːd/

🔊

NAmE

/ˈtrʌmp kɑːrd/

🔊

noun

trump

(1)

something that gives you an advantage over other people, especially when they do not know what it is and you are able to use it to surprise them 王牌；绝招；杀手锏