have a card up (one's) sleeve

(redirected from have a card up my sleeve)

have a card up (one's) sleeve

To secretly have power or control over someone or something else. She has a card up her sleeve if they ever try to fire her, since she knows about the boss's unscrupulous business practices
See also: card, have, sleeve, up

have a card up your sleeve

have a plan or asset that is kept secret until it is needed. British
See also: card, have, sleeve, up