Befoul

Verb

1. To make foul; to soil; to contaminate, pollute.
2. (specifically) To defecate on, to soil with excrement.
3. To stain or mar (e.g., with infamy or disgrace).
4. To stain or mar (e.g., with infamy or disgrace).
5. (The addition of quotations indicative of this usage is being sought:) To entangle or run against so as to impede motion.