他背弃了诺言，离开了他的妻子。

He reneged on a promise to leave his wife.

《柯林斯英汉双解大词典》

他背弃了自己的诺言。

He receded from his promise.

youdao

布莱尔先生遭到的是双重反对，因为我们的首相背弃了他曾承诺过的，对《里斯本条约》举行全民公决的诺言，正是这一条约缔造了这个令他神魂颠倒的非常职位。

The case against Mr Blair is twofold: as our prime minister, he broke his promise to hold a referendum on the Lisbon Treaty, which creates the very post he apparently aspires to hold.

youdao