## Etymology
From Old English domes dæg ('day of judgment'), from dom ('judgment, doom') + dæg ('day'). Dom is from Proto-Germanic *dōmaz, from PIE *dhe- ('to set, put').

## AI Etymology
Doomsday is from Old English domes dæg ('day of judgment'), from dom ('judgment, doom') + dæg ('day'). Dom is from Proto-Germanic *dōmaz, from PIE *dhe- ('to set, put'). The ancestry passes through Old English domes dæg, Old English dom, and Proto-Indo-European *dʰeh₁-. In present use as a noun, it means "the day of the Last Judgment; a time of catastrophe", keeping the historical formation close to the word's ordinary semantic work. Related words include doom, day, and doomsman. The surrounding word family keeps the same base visible in doom, day, and doomsman, showing how the headword belongs to a larger cluster rather than standing alone.

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