card up sleeve
a card up (one's) sleeve
A secret plan, idea, or advantage that can be utilized if and when it is required. A reference to cheating at a card game by hiding a favorable card up one's sleeve. 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, sleeve, up
Farlex Dictionary of Idioms.
card up (one's) sleeve
A secret resource or plan held in reserve: a tough negotiator who had a number of cards up his sleeve.
See also: card, sleeve, up
American Heritage® Dictionary of the English Language, Fifth Edition.
- a card up (one's) sleeve
- have (something) up (one's) sleeve
- have a card up your sleeve
- have an ace up (one's) sleeve
- have an ace up your sleeve
- have an ace/a trick up your sleeve
- have got an ace up (one's) sleeve
- have something up your sleeve
- have up sleeve
- trick up (one's) sleeve