have an ace in the hole

have an ace in the hole

If you have an ace in the hole, you have something which you can use to gain an advantage when you need it. Note: In many card games, the ace is the card with the highest score. He doesn't usually risk much unless he thinks he has an ace in the hole. Note: In `stud' poker, you have an ace in the hole when you have an ace as your `hole' card: see `hole card' at hole.
See also: ace, have, hole