包角 英语怎么说

包角的英文表达是 "to have an ace up one's sleeve." 这个短语的来源源于扑克游戏，当某个人隐藏起来一张扑克牌，以备在最后时刻出现并获胜时，就称这个人 "包角" 了。
例句：
I think she has an ace up her sleeve. 我认为她包角了。
Don't underestimate him. He always has an ace up his sleeve. 别小看他，他总是包角。