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.
membuktikan dengan tindakan, mengikuti kata-kata dengan perbuatan
to prove your claims or intentions by actions, especially by spending money
:
•
If you really believe in that startup, then put your money where your mouth is and invest in it.
Jika kamu benar-benar percaya pada startup itu, maka buktikan dengan tindakan dan investasikan uangmu di sana.
•
He always talks about helping the poor, but he never actually puts his money where his mouth is.
Dia selalu berbicara tentang membantu orang miskin, tetapi dia tidak pernah benar-benar membuktikan dengan tindakan.