crazy; demented

simple past tense and past participle of crack up

(informal, simile) Utterly crazy or insane.

simple past tense and past participle of crack out

(drugs, slang) Appearing excessively high or hooked on crack cocaine. / (by extension) Mentally and physically exhausted due to excessive drug consumption.

simple past tense and past participle of crack wise

Alternative form of cracked wheat

(idiomatic) As good as claims or reputation would suggest.

simple past tense and past participle of crack someone's egg

(cooking) A type of bread made from cracked wheat which has been ground into fine particles.