tarnish

Oxidation or discoloration, especially of a decorative metal exposed to air.

To oxidize or discolor due to oxidation.

“Careful storage of silver will prevent it from tarnishing.”

To compromise, damage, soil, or sully.

“He is afraid that she will tarnish his reputation if he disagrees with her.”

figurativeTo lose its lustre or attraction; to become dull.

copyrightTo use a sign, image, expression, etc. sufficiently close to a trademarked one that it brings disrepute to it.

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”