the day of doom (=doomsday)
we'll be here till doomsday if you go blethering on.
The Doomsday Clock is a symbolic clockface that the Bulletin has maintained since 1947 at its headquarters on the campus of the University of Chicago.
Lensman. E.E. "Doc" Smith. Classic space opera with pure-as-Boy-Scout heros and unrelentingly evil bad guys fighting for control of planet-squishing "doomsday devices."
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