definition of
tarnish

[1] #1 tarnish v. [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". wn

[2] #2 tarnish n. discoloration of metal surface caused by oxidation. wn