ace in the hole

listen to the pronunciation of ace in the hole
İngilizce - Türkçe
İngilizce - İngilizce
A hidden or secret strength, or unrevealed advantage

Our ace in the hole left our opponents stupefied; it isn't every day that an NBA star plays street basketball.

trump card; something that can be saved and used as an advantage later
in the hole
(deyim) In debt
ace in the hole