The sound that heralds the day of the Last Judgment, when God will decree the fates of all men according to the good and evil of their earthly lives.

From Shakespeare’s Macbeth, 1605:

MACBETH: Thou art too like the spirit of Banquo: down!
Thy crown does sear mine eye-balls. And thy hair,
Thou other gold-bound brow, is like the first.
A third is like the former. Filthy hags!
Why do you show me this? A fourth! Start, eyes!
What, will the line stretch out to the crack of doom?