Besmirch (verb)

1. To tarnish the reputation or integrity of someone or something.
2. To soil or defile something.

Origin:

Derived from the old english words "besmērian" and "besmērcan" meaning to soil or defile.

Examples:

1. The politician's opponents tried to besmirch his good name with false accusations.
2. The oil spill besmirched the once pristine beach.
3. She was afraid that her association with the scandal would besmirch her reputation.
4. The graffiti besmirched the beauty of the ancient monument.
5. The athlete's doping scandal besmirched his legacy.