[fā fēng]
go mad; go [become; be] crazy; become [go] insane; be out of one's mind; drive sb. crazy; be off one's head; be beside oneself; lose one's mind
The letter made her insane with jealousy.
那封信使她妒忌得发疯。
She has gone crazy from grief.
她因悲伤而发疯。
It would be downright [sheer] madness to do such a thing.
做这种事纯粹是发疯。