Ace up One's Sleeve

What Does "Ace up One's Sleeve" Mean?
"Ace up one's sleeve" is an English idiom. It means "a surprise or secret advantage."Examples in Sentences
Here are three examples of the idiom "ace up one's sleeve" used in a sentence:- I think he has an ace up his sleeve for the final round.
- You never know with her; she always has an ace up her sleeve.
- During the debate, he pulled an ace up his sleeve and surprised everyone.
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