go back on one's own words;break one's promise;fail to keep one's promise;fail to live up to one's promise ;
You can't go back of your promise.
你不能自食其言.
You promised to help-you mustn't back out now.
你答应过要帮忙的,你不应该自食其言.
" I made the peace, remember, I can't go back on my word. "
“ 讲和是我自己提出的, 要记着, 我可不能自食其言.
He never breaks his word.
他从不自食其言.
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