put one’s money where one’s mouth is

(idiom) to take some action to support something you have said

Example Sentences:

A: It’s so easy to be a painter.
B: Why do you think that?
A: Anyone can paint! My child could be a painter!
B: Well, why don’t you put your money where your mouth is. Prove it!
A: Okay, I will!

When Mark said he could do 100 push-ups, his co-workers challenged him to put his money where his mouth is, and bet him $100 that he couldn’t. When he only did 30, he was forced to pay them.

Media:

Similar idioms:

1. put one’s foot in one’s mouth
2. live from hand to mouth
3. best bet
4. look a gift horse in the mouth
5. shoot one’s mouth off
6. have one’s heart in one’s mouth
7. you bet your ass
8. down in the mouth
9. mouth watering