What is another word for tarnish?

Here are some synonyms for tarnish, depending on the context:

General:

* Discolor

* Dull

* Dim

* Stain

* Soiled

* Smudge

* Cloud

* Fading

* Rust (for metals)

Figurative:

* Spoil

* Damage

* Compromise

* Mar

* Besmirch (for reputation)

* Defile (for purity)

The best synonym will depend on the specific situation and the type of tarnish you're referring to.