/ Dictionary / Index C crackup: Meaning and Definition of Find definitions for: crack•up Pronunciation: (krak'up"), [key] — n. a crash; collision. a breakdown in health, esp. a mental breakdown. collapse or disintegration: the crackup of an alliance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. crack the whip cracky Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language