put one's money where one's mouth is

1. 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]

Example Sentences

Not only is it good common sense to put one's money where one's mouth is, it might also form the basis for good corporate and perhaps even regulatory policy.

From Washington Post