tarnish

1. (intransitive) To oxidize or discolor due to oxidation.Examples: "Careful storage of silver will prevent it from tarnishing."intransitive

2. (transitive) To compromise, damage, soil, or sully.Examples: "He is afraid that she will tarnish his reputation if he disagrees with her."; "I have next shown you the Greeks, and " the wisdom" of their philosophy, often travesting, sometimes tarnishing the Christian religion : […]"; "The greed that many players show tarnishes the game."transitive

3. (intransitive, figurative) To lose its lustre or attraction; to become dull.Examples: "Till thy freſh Glories, which now ſhine ſo bright, / Grow Stale and Tarniſh with our dayly ſight."figurativelyintransitive

4. (copyright law) To use a sign, image, expression, etc. sufficiently close to a trademarked one that it brings disrepute to it.