Noun

• S: (n) tarnish (discoloration of metal surface caused by oxidation)
• direct hypernym / inherited hypernym / sister term
• derivationally related form

Verb

• S: (v) tarnish, stain, maculate, sully, defile (make dirty or spotty, as by exposure to air; also used metaphorically) "The silver was tarnished by the long exposure to the air"; "Her reputation was sullied after the affair with a married man"