put one's money where one's mouth is

put (one's) money where (one's) mouth is

To do, live up to, or follow through on something one talks about, threatens, or promises, especially (but not always) when it involves spending money. Fans who have been demanding a sequel for the last decade had better put their money where their mouth is and go buy a ticket! He promised to lower taxes if he got elected; now let's see if he'll put his money where his mouth is.
See also: money, mouth, put

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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