It's proof, or a guarantee, that you believe so strongly in what you're saying that you're willing to back it up with your money. It's a way of saying what you mean and meaning what you say. Отвечать за свои слова

stand by one's words (I stand by my words. VLZ_58); mean what you say (SirReal); put your money where your mouth is (Ihor Sapovsky); stand by your words (VLZ_58)

put the money where your mouth is (put ONE's money where one's mouth is Arky)

stand by one's word (This makes you look bold and hawkish so be prepared to stand by your word. 4uzhoj)

Отвечать за свои слова

: 3 phrases in 2 subjects

General	1
Idiomatic	2