· discoloration of metal surface caused by oxidation
Hypernym(s): stain, discoloration, discolouration
· 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"
Synonym(s): stain, maculate, sully, defile
Hypernym(s): spot, fleck, blob, blot