force someone's hand

Idioms  

1. Compel someone to act or speak prematurely or against his or her will. For example, He didn't want to decide just then, but the board forced his hand. This expression probably alludes to the hand (the cards) held in a game such as whist or poker, in which a player is compelled to play some card from his hand or to reveal his hand. [Mid-1800s]

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Example Sentences

“I want to force someone’s hand,” he said.

From New York Times

"All you can do is try to force someone's hand as a player, force someone to make a decision, good or bad," Featherston said.

From Los Angeles Times