fail to keep faith;eat one's words;fail to carry out one's promise;fail to live up to one's promise ;
You shouldn't have copped out on a promise.
你不应该言而无信.
He broke his word.
他言而无信.
Do not break your word if you want help.
如果你要人帮助我,就不可言而无信.
What is a gentleman but his word?
言而无信,算什么绅士?
But you promised to help us, you rat!
可是你答应过要帮我的忙, 你这言而无信的小人!
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