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3. put one's money where one's mouth is

put one's money where one's mouth is

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put one's money where one's mouth is

Back up one's opinion with action, as in He goes on and on about helping the homeless; I wish he'd put his money where his mouth is . This idiom, alluding to contributing cash to support one's stated views, has been broadened to include any kind of action. [First half of 1900s]

See also: money, mouth, put