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

Übersetzungen
подкрепить слова делом
If he believes in the project, he should put his money where his mouth is.
Если он верит в проект, он должен подкрепить слова делом.
Definitionen
To back up one's words or claims with action or financial commitment, demonstrating that one truly believes in what they are saying.