/ Dictionary / Index C crack of doom: Meaning and Definition of Find definitions for: crack' of doom' Pronunciation: [key] the signal that announces the Day of Judgment. the end of the world; doomsday. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. crack of dawn crackpot Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language