Ace up one's sleeve
Meaning
A secret advantage or plan that one keeps hidden until the most opportune moment to use it.
Origin
The phrase "ace up one's sleeve" vividly evokes the illicit practices of 19th-century card sharps and their ingenious methods of cheating. During this era, as gambling dens flourished, professional swindlers would master sleight of hand, concealing a high-value card—often an ace, the most powerful card in many games—within the folds of their loose-fitting sleeves. When the stakes were highest, they would subtly introduce this hidden card into play, guaranteeing themselves a win. This infamous trick, once a symbol of dishonesty at the card table, transcended its origins to become a widely understood idiom for any powerful, hidden advantage or secret plan, ready to be revealed at just the right moment.
Examples
- The politician always kept an ace up her sleeve, waiting for the perfect time to reveal the damning evidence against her opponent.
- Our team was losing badly, but the coach had an ace up his sleeve, bringing on a rookie player who scored the winning goal in the final minutes.