fly off the handle
US /flaɪ ɔf ðə ˈhændl/
UK /flaɪ ɔf ðə ˈhændl/

1.
发脾气, 大发雷霆
to suddenly lose your temper and become very angry
:
•
He tends to fly off the handle when he's stressed.
他压力大的时候容易发脾气。
•
Try not to fly off the handle, it won't solve anything.
尽量不要发脾气,那解决不了任何问题。