tarnish

/ˈtɑrnɪʃ/
verb
  1. To make or become dull, discolored, or less shiny, especially on a metal surface.
    • Don't use harsh chemicals that might tarnish the finish.
    • The brass doorknob began to tarnish after years of use.
    • Silver jewelry will tarnish if exposed to air for too long.
  2. To damage or spoil the good reputation or image of someone or something.
    • A single mistake can tarnish a company's reputation for years.
    • He tried to tarnish her name with false rumors.
    • The scandal tarnished the politician's career.
noun
  1. A thin layer of discoloration or dullness on a metal surface, caused by exposure to air or chemicals.
    • The tarnish on the medal made it look much older than it was.
    • The old silver spoon had a layer of tarnish that needed polishing.
    • You can remove tarnish from copper with lemon juice and salt.
  2. Damage to a reputation or image.
    • The scandal left a permanent tarnish on the organization.
    • Years of honest work helped erase the tarnish from the company's past.
    • The tarnish on his good name was hard to remove.