put your money where your mouth is
US /pʊt jʊər ˈmʌn.i wɛr jʊər maʊθ ɪz/
UK /pʊt jʊər ˈmʌn.i wɛr jʊər maʊθ ɪz/
1.
to prove your claims or intentions by actions, especially by spending money
:
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If you really believe in that startup, then put your money where your mouth is and invest in it.
•
He always talks about helping the poor, but he never actually puts his money where his mouth is.