have a card up your sleeve
成語所屬單字card
have a card up your sleeve — 慣用語
1. To have a secret plan or idea that will give you an advantage when needed.
1.慣用語
釋義
有祕密計劃
To have a secret plan or idea that will give you an advantage when needed.
例句
Aiden always has a card up his sleeve during negotiations.
Sara had a card up her sleeve for the final round.