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If he promised to help, he will not go back on his promise.
如果他答应帮忙，他就不会食言。
《新英汉大辞典》
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You can't go back on your words once you make a promise on something!
我们不能相信他，他这人总是说话不算数！
youdao
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You can't go back on your words once you make a promise on something!
我们不能相信他，他这人总是说话不算数！
youdao