发疯

发疯 [fā fēng]

1. ■ 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:

那封信使她妒忌得发疯。 The letter made her insane with jealousy.

她因悲伤而发疯。 She has gone crazy from grief.

做这种事纯粹是发疯。 It would be downright [sheer] madness to do such a thing.