Tarnish
WordNet
noun
(1) Discoloration of metal surface caused by oxidation
verb
(2) 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"
WiktionaryText
Noun
- Oxidation or discoloration, especially of a decorative metal exposed to air.
Verb
- To oxidize or discolor due to oxidation.
- Careful storage of silver will prevent it from tarnishing.
- To soil, sully, damage or compromise
- He is afraid that he will tarnish his reputation if he disagrees.