tarnish -- (discoloration of metal surface caused by oxidation)
Overview of verb tarnish
The verb tarnish has 1 sense
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")
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