短语 fly off the handle 的意思是大发脾气，勃然大怒。

例句

When I told Dad I had crashed his car again he flew off the handle.

Jane is trying to get to sleep, so if you wake her up she will fly off the handle.

请注意

短语 to get a handle on something 的意思是理解、掌握某事。

例句

I don't like this new computer - I can't get a handle on the strange keyboard.