What does "crack of doom" mean?

The signal for the final dissolution of all things by God; the last trump; the end of the world.

What is a synonym for "crack of doom"?

Common synonyms include: catastrophe, cessation, coda, conclusion, consummation, culmination.

noun

noun ·Rare ·Advanced level

Noun

1
The signal for the final dissolution of all things by God; the last trump; the end of the world.
"Why do you ſhew me this?—A fourth? Start eyes! / What will the Line ſtretch out to th' cracke of Doome?"
2
(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 wordnet

"Why do you ſhew me this?—A fourth? Start eyes! / What will the Line ſtretch out to th' cracke of Doome?"

Referring to a loud noise, as in “crack of thunder”, suggested in Revelation 6:1 and 8:5.