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]
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How to use put one's money where one's mouth is in a sentence
To put it rather uncharitably, the USPHS practiced a major dental experiment on a city full of unconsenting subjects.
Added to drinking water at concentrations of around one part per million, fluoride ions stick to dental plaque.
In his view, a writer has only one duty: to be present in his books.
Yet this, in the end, is a book from which one emerges sad, gloomy, disenchanted, at least if we agree to take it seriously.
The fear of violence should not determine what one does or does not say.
Practise gliding in the form of inflection, or slide, from one extreme of pitch to another.Expressive Voice Culture|Jessie Eldridge Southwick
He alludes to it as one of their evil customs and used by them to produce insensibility.
There was a rumor that Alessandro and his father had both died; but no one knew anything certainly.Ramona|Helen Hunt Jackson
He was voluble in his declarations that they would “put the screws” to Ollie on the charge of perjury.The Bondboy|George W. (George Washington) Ogden
Truth is a torch, but one of enormous size; so that we slink past it in rather a blinking fashion for fear it should burn us.Pearls of Thought|Maturin M. Ballou