From Middle English filth, from Old English fȳlþ (“foulness, filth”), from Proto-Germanic *fūliþō (“foulness, filth”), from Proto-Germanic *fūlaz (“foul, corrupt, dirty, vile”), from Proto-Indo-European *pū- (“rottenness, pus”), equivalent to foul + -th. Cognate with Dutch vuilte (“filth”). More at foul.
- (UK, pejorative, slang) the police
- (US, agriculture, dated) weeds growing on pasture land
- Grampa remembers when he had to cut filth with a scythe.