To reveal one's true intentions, plans, or capabilities; to disclose information that was previously kept secret, often prematurely or disadvantageously.
Direct from poker and other card games where players must eventually reveal their cards ('show their hand') to determine the winner. The phrase emerged in the mid-1800s as poker became popular in America, and the strategic importance of timing when to reveal your cards made it a perfect metaphor for disclosure in other competitive contexts.
This phrase captures a crucial moment of vulnerability in both cards and life - once you show your hand, you can't take it back, and others can use that information against you. The timing of when to 'show your hand' often determines success or failure, whether you're negotiating a business deal or revealing feelings in a relationship.
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