filthen
verbEtymology From filth + -en, modelled after healthen, strengthen, lengthen, etc.
1
Nonstandard, Rare To cover with filth; besmut; besmirch; make filthy.
- Rock oil was considered, then, a local nuisance, a malodorous black gunk that floated like a rumor down the creek, filthening whatever it touched: a farmer's overalls, a cow's hide, a child's shoes.2016, Jennifer Haigh, Heat and Light: