weasel out (of something)
phrasal verb with weasel verb uk/ˈwiː.zəl/ us/ˈwiː.zəl/
mainly US informal
（尤指不诚实地）推诿，逃避（答应过的事）
to avoid doing something that you have agreed to do, especially by being dishonest
Although they had signed the contract they tried to weasel out of the deal later. 尽管他们已经签了合同，但事后却试图逃避这笔买卖。