We found one dictionary that defines the word doomsday events:

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1. doomsday events: Wiktionary

▸ Words similar to doomsday events ▸ Usage examples for doomsday events ▸ Idioms related to doomsday events ▸ Wikipedia articles (New!) ▸ Words that often appear near doomsday events ▸ Rhymes of doomsday events ▸ Invented words related to doomsday events