put one's money where one's mouth is

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
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