Doomsday
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The day the world explodes, freezes over, burns, is [zapped], [poisoned], taken over, or otherwise [rendered] uninhabitable.
Doomsday meaning & definition 1 of Doomsday.
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The last day of the world
Doomsday meaning & definition 2 of Doomsday.
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the end of the world, or a time when something very bad will happen:
Doomsday meaning & definition 3 of Doomsday.