Associations:

An ''ace in the hole'' is a hidden advantage; in some cases it refers specifically to a gun secreted in a shoulder holster.

''As black as an ace of spades'' means extremely black.

An ''ace'' is a one-dollar bill.

In African-American slang, an ''ace boon coon'' or ''ace boom boom'' is a very good friend.

In African-American slang, an ''ace coon'' is a token black person in a position of importance that is usually occupied by a white person.

In African-American slang, an ''ace lover'' is one's primary or most important lover.