1. to make or become dull, discolored, or less bright, especially through oxidation or corrosion
2. to damage or spoil the reputation or image of someone or something

1. a dull film or discoloration on the surface of metal

Examples

• The silver jewelry began to tarnish after being exposed to air.
• Salt water can tarnish metal fixtures quickly.
• The scandal tarnished the politician’s reputation.
• Years of neglect had tarnished the company’s image.
• She polished the brass to remove the green tarnish.
• The mirror showed signs of tarnish around the edges.
• Don’t let one mistake tarnish your entire career.