1.back out of 食言；收回；退出
If the person you were engaged to marry had an accident and become a paraplegic , would you go through with the marriage or back out of it?
如果你的未婚夫因为车祸瘫痪了，你会坚持和他结婚，还是退婚呢？

2.bristled at 对……不满
Privately, some of my staff bristled at this assessment, feeling that itdiscounted our hard work and the appeal of our message.
在私底下，我竞选团队的一些成员对这种评价十分不满，觉得这是轻视我们辛勤的工作和为民服务的美好意愿@[1dyyY^Cec(~UOdg!Z。

3.one's hair on fire 忙得不可开交
Do you need help? it looks like your hair is on fire.
需要帮助吗？看你好像忙得不可开交的样子58=7mXyumjj6a。

4.retaliate with 反击
If you are rude to me, I shall retaliate with equal rudeness.
如果你对我无礼，我会以牙还牙iJT;ubbH._hO。