go back on one's word [promise];cop out on;pull back ;

Paul agreed to help but now he's back-pedalling because he says he's too busy.
保罗同意帮忙,可是他现在反悔了,因为他说他太忙了.
来源:互联网摘选It may well be worth waiting for better times before making any irrevocable commitment.
最好等到更合适的时候再作出不能反悔的承诺。
来源:《柯林斯高阶英汉双解学习词典》Neither side can draw back from the agreement once the contract is signed.
合同一旦签订,任何一方都不准反悔.
来源:《简明英汉词典》To refuse baptism and to retract after baptism were crimes punishable by death.
凡拒绝受洗和受洗后反悔的都以死刑论罪.
来源:词典精选例句
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