1.go back on one's word
背弃自己的诺言收藏指正
2.go back on one's word
说话不算话收藏指正
3.break one's promise; go back on one's word
违背约言收藏指正
4.break a promise; go back on one's word
违背诺言收藏指正
5.fail to keep faith; go back on one's word
言而无信收藏指正
6.go back on one's word in the twinkling of an eye
转脸不认账收藏指正
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