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Middle English word foulen comes from Proto-Indo-European *puH-, Proto-Indo-European *pow-, and later Proto-Germanic *bi- (By, at; a general locative prefix.)
*puH- (Proto-Indo-European)
*pow- (Proto-Indo-European)
*bi- (Proto-Germanic)
By, at; a general locative prefix.
*fūlaz (Proto-Germanic)
Foul, dirty. Rotten.
*fūlijaną (Proto-Germanic)
(intransitive) To become foul; rot; decay.
*fūlijaną (Proto-Germanic)
(transitive) To befoul; make dirty.
fūlian (Old English)
fȳlan (Old English)
foulen (Middle English)