Words at Play : Top 10 Favorite Definitions
The Definition:
ace in the hole
1 : an ace dealt face down to a player (as in stud poker) and not exposed until the showdown
2 : an effective and decisive argument or resource held in reserve
Editor's Note:
"Ace in the hole is a phrase that's both familiar and vague but its meaning becomes clear
when you read the first definition (the one that talks about actual playing cards) along with the second more
metaphorical one."