day_of_reckoning
1. [ noun ] (New Testament) day of the Last Judgment when God will decree the fates of all men according to the good and evil of their earthly lives
Synonyms: judgement_day day_of_judgement doomsday end_of_the_world day_of_judgment judgment_day last_day last_judgement last_judgment crack_of_doom
Related terms: day New_Testament
2. [ noun ] an unpleasant or disastrous destiny
Synonyms: doom end_of_the_world doomsday
Examples:

"everyone was aware of the approaching doom but was helpless to avoid it" "that's unfortunate but it isn't the end of the world"

Related terms: destiny doom