Noun has 1 sense

• last day(n = noun.time) crack of doom, day of judgement, day of judgment, day of reckoning, doomsday, end of the world, eschaton, judgement day, judgment day, last judgement, last judgment - (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;