set sb off 的意思

set off的意思是出发 启程 激起 引起 你问的意思是让某人开始做某事

有大哭和崩溃的意思。
his words set her off,就是他的话让她大哭起来。

使(某人)开始(做某事)

set sb off
to make someone start laughing, crying, or talking about something (使某人开始做某事)

例句：Don't mention what happened - you'll only set her off again.

- set somebody off
to make someone start laughing, crying, talking about something or to make someone angry