'crack of doom' definitions:

Definition of 'crack of doom'

From: WordNet
noun
(New Testament) day at the end of time following Armageddon when God will decree the fates of all individual humans according to the good and evil of their earthly lives [syn: Judgment Day, Judgement Day, Day of Judgment, Day of Judgement, Doomsday, Last Judgment, Last Judgement, Last Day, eschaton, day of reckoning, doomsday, crack of doom, end of the world]