fly off the handle难道是“放飞自我”？意思有点接近，但这个“放飞自我”可不是主动追求自由，而是“被情绪牵着飞”，也就是被情绪所支配。

fly off the handle就是指“大发脾气；勃然大怒”。

I've never seen her fly off the handle like that before.

我以前从没见过她发这么大脾气。

Unless some decision was reached, they might fly off the handle and do something foolish.

除非做出什么决定，否则他们可能会大发雷霆，甚至做出蠢事。