for dear life 拼命地；尽最大努力地

【例句】
Upon seeing the man pull a knife, Sally ran for dear life.
看见男子拔出刀，莎莉拼命地逃跑了。

As the ship began to tilt, we clung on for dear life.
当船开始倾斜的时候，我们竭力抓住船身。