DictionarytarnishMetal discoloration
noun / verb

tarnish

TAR-nish/ˈtɑːrnɪʃ/

Discoloration dulling a metal surface.

Dull gray-black tarnish covers the silver goblet and hides its shine.

A simple left-to-right transformation shows the same silver goblet losing its brightness: initially polished and reflective, then covered with dull gray-black tarnish.
Etymology

The French verb meant to dull brightness or luster. English applied this especially to metals losing their shine, then extended the image to tainted purity or damaged reputation: something valued loses its former brilliance.

In context

PROACTIVELY5:31
One of the most destructive behaviors is gossip. Envious people invent stories, twist facts, and spread malicious comments to tarnish your image.
6 Signs That Someone Is Envious of You

More examples

  • Silver tarnishes when exposed to certain compounds in the air.
  • She gently removes the tarnish from the antique spoons.
  • Moisture has tarnished the brass handles.

Forms

tarnish · tarnishes · tarnished · tarnishing

Similar words

patina
An aged surface layer, often valued for its appearance.
corrosion
Chemical deterioration of metal, potentially deeper than surface discoloration.