have a card up your sleeve
成語所屬單字sleeve
have a card up your sleeve — 慣用語
1. To have a secret plan or idea that gives you an advantage.
1.慣用語
釋義
留有後手
To have a secret plan or idea that gives you an advantage.
例句
Sara always has a card up her sleeve during debates.
Did Diego have a card up his sleeve when he made that offer?