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.
Taten sprechen lassen, Worten Taten folgen lassen
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.
Wenn du wirklich an dieses Startup glaubst, dann lass Taten sprechen und investiere darin.
•
He always talks about helping the poor, but he never actually puts his money where his mouth is.
Er redet immer davon, den Armen zu helfen, aber er lässt nie Taten sprechen.