put one's money where one's mouth is

Idioms & Phrases

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]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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