trump card
英 [ˈtrʌmp kɑːd]
美 [ˈtrʌmp kɑːrd]
n. 王牌; 绝招; 杀手锏
牛津词典
noun
noun
- 王牌；绝招；杀手锏
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
英英释义
noun
- a playing card in the suit that has been declared trumps
- the ace of trumps is a sure winner