Definition
To behave in a crazy or irrational manner.
發瘋
He must be off his head to try swimming in this storm.
他一定是瘋了，才會想在這種暴風雨中游泳。
You must be off your head to believe that nonsense.
你一定是瘋了，才會相信那種胡說八道。
She must be off her head to quit her stable job for an unrealistic dream.
她一定是瘋了，才會放棄穩定的工作去追求一個不切實際的夢想。
To be in a state where one's behavior is uncontrolled due to excessive alcohol or drug consumption.
醉酒或吸毒後失控
He was completely off his head last night after drinking too much.
他昨晚喝太多，完全失控了。
She looked off her head, probably from taking drugs.
她看起來神智不清，可能是因為吸毒。
The group of young people were off their heads after getting drunk.
那群年輕人喝醉後完全失控了。