English
filthen
From filth + -en, modelled after healthen, strengthen, lengthen, etc.
Formed from filth + -en
Proto-Indo-European *puH- ‘to be rotten’
…
Proto-West Germanic *fūl ‘foul, dirty’
Proto-West Germanic *fūliþu ‘foulness, rottenness, filth’
Old English fȳlþu
Middle English filth
English filth
Today it means
verb To cover with filth; besmut; besmirch; make filthy.
Language periods are conventional ranges, not dates for this word.
Etymograph / filthen