Where does “brainrot” come from?

brainrot (English) comes from English rot, from Middle English roten, from Middle English rote, from Old French rote, from Latin rupta, from Latin ruptus, from Latin rumpō, from Proto-Indo-European Hrunépti — to tear out, dig out, open, acquire.

Ancestry of “brainrot”, step by step

brainrot traces back through two separate lines of ancestry.

via English rot

StepLanguageWordMeaning
1EnglishrotTo suffer decomposition due to biological action,...
2Middle EnglishrotenTo decompose; to make or become rotten or spoiled
3Middle EnglishroteThe root; The foundation or base of a...
4Old Frenchroteroute, path
5Latinruptanominative feminine singular of ruptus;...
6Latinruptusbroken; ruptured, burst
7Latinrumpōto break, burst, tear, rend, rupture; break asunder, force open
8Proto-Indo-EuropeanHrunéptito be breaking
9Proto-Indo-EuropeanHrewp-to break, tear
10Proto-Indo-EuropeanHrew-to tear out, dig out, open, acquire

via English brain

StepLanguageWordMeaning
1EnglishbrainThe control center of the central nervous system...
2Middle EnglishbraynThe brain or cerebrum; the organ of thought;...
3Old Englishbræġnbrain
4Proto-West Germanic*bragnbrain
5Proto-Germanicbragnąbrain
6Proto-Indo-Europeanmregʰnomskull, brain
7Proto-Indo-Europeanmen-to think, mind; spiritual activity; to stay,...

Words derived from “brainrot

Every word from Proto-Indo-European Hrew-
brainrot — Etymology, Origin & Word History | Etymology Explorer