go back onsth
—phrasal verbwithgoverbuk/ɡəʊ/us/ɡoʊ/present participlegoing|past tensewent|past participlegone
tofailtokeepapromise, or tochangeadecisionoragreement
违背（承诺或协议）；改变（决定）
Thegovernmentlookslikelyto go back onitsdecisiontoclosethemines.看来政府可能会出尔反尔，推翻原先关闭矿井的决定。
She's gone back onher wordanddecidednot to give me thejobafter all.她说话不算话，竟然决定不再给我那个工作了。