play (one's) ace (card)

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play (one's) ace (card)

To make use of a resource that one knows or hopes will ensure a decisive and successful outcome. She played her ace card during the debate by bringing up her opponent's earnings from investment firms that caused the global recession just a few years prior. The prosecutor then played his ace, showing CCTV footage clearly placing the suspect at the scene of the crime.
See also: ace, play

play your ace

If you play your ace, you do something clever and unexpected which gives you an advantage over other people. Note: In many card games, the ace is the card with the highest score. He told us that he was a very important criminal lawyer who had defended men on heavy charges. And then he played his ace. He also had a number of clients who were involved in the gold business.
See also: ace, play