
Go back on (one's) word

Translation of "go back on (one's) word" into Russian
go back on (one's) word
He promised to help us, but he went back on his word.
Он обещал помочь нам, но нарушил своё слово.
Definitions
To fail to keep a promise or commitment; to break one's word or not do what one has said they would do.