n. go back on one's word
misc. break one's promise
On the other side, the system guarantee should emphasize“punish for break faith”to enhance the opportunity cost .
制度保证的另一个方面就是“失信惩戒”,增大失信的机会成本。
·2,447,543篇论文数据，部分数据来源于NoteExpress
I am sorry that I broke my promise.
对不起， 我失信了。
对不起，我失信了。
《新英汉大辞典》
十之八九他失信了。
Most likely he has broken his promise.
我们对结果感到失望，但是并未丧失信心。
We're disappointed by these results but we're not downhearted.
《牛津词典》
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