once and for all

词性：固定短语 / idiom

意思：一劳永逸地；彻底地；最终解决

强调一次性把事情彻底解决，以后不再需要处理。

Let's settle this once and for all.
我们把这件事彻底解决掉吧。

They wanted to defeat their enemy once and for all.
他们想彻底击败敌人。

He decided to leave the country once and for all.
他决定彻底离开这个国家。

拆开理解

once = 一次
and for all = 并且彻底地

合起来：

once and for all → 一次就彻底解决 → 一劳永逸

很常见的搭配

• settle it once and for all = 一劳永逸地解决这件事
• end it once and for all = 彻底结束它
• defeat someone once and for all = 彻底击败某人
• prove something once and for all = 最终彻底证明某事

你现在的一战视频里如果出现：

They wanted to settle the conflict once and for all.

就是：

他们想彻底解决这场冲突。

这里的重点不是“只做一次”，而是 “彻底解决，以后不再反复”。