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English definition of “doomsday”

doomsday

noun [U] uk   /ˈduːmz.deɪ/ us  
the end of the world, or a time when something very bad will happen: Ecologists predict a doomsday scenario (= a time when death and destruction will happen) if global warming continues to increase at the present rate. You could talk till/until doomsday (= for a very long time), but they will never change their minds.
(Definition of doomsday from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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