Definitions from Wiktionary ( )

▸ noun:  Oxidation or discoloration, especially of a decorative metal exposed to air.
▸ verb:  (intransitive) To oxidize or discolor due to oxidation.
▸ verb:  (transitive) To compromise, damage, soil, or sully.
▸ verb:  (intransitive, figurative) To lose its lustre or attraction; to become dull.
▸ verb:  (copyright law) To use a sign, image, expression, etc. sufficiently close to a trademarked one that it brings disrepute to it.

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