Meaning

noun a blemish made by dirt

noun an act that brings discredit to the person who does it

verb smear so as to make dirty or stained

originFrom Middle English *smorchen ("to spatter, soil"; attested in besmorchid (“bespattered, soiled all over”)), of uncertain origin. Perhaps a derivative of Middle English smeoren, smuren, smeren (“to smear”) or related to Middle English smotry (“sooty, grimy”). Compare also Middle English bismotered (“bespattered, soiled”), Old French esmorcher (“to torture”), Middle English smoterly, smoterlich…

Etymology from Wiktionary, CC BY-SA 3.0