Ace in the hole

Meaning

A hidden advantage kept in reserve until it's needed.

Usage

Popular in contexts where strategy or competition is discussed.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

From stud poker, where an 'ace' dealt face down was a secret asset.

Spread through gambling jargon into general English by the early 1900s.