befoul

verb4

1. •
   To make foul; to soil; to contaminate, pollute.

   • Only the four walls of his home still stood, blackened and smoking with the sluggish, stinking smoke that befouled the sea-wind. — 1983
2. •
   To defecate on, to soil with excrement.

   • For its an ill Bird will befoule her own Nest […] — 1666
3. •
   (figurative) To stain or mar (e.g., with infamy or disgrace).

   • “[…] you combine a vulgar atheism and an iconoclastic desire to befoul the sacred ideas of the average man or woman, collectively scorned as the bourgeoisie——” — 1923
4. •
   To entangle or run against so as to impede motion.