grime

verb

To cover something with a layer of dirt or filthy matter.

"The city air quickly grimes the buildings."

noun

A layer of dirt, soot, or other filthy matter, often accumulated over time.

"The old window was covered in thick grime."

Thesaurus

Synonyms: begrime, dirty, colly, soil, bemire, dirt, stain, filth, grease, grunge

Antonyms: clean, make clean