befouling

/B EH1 F AW1 L IH0 NG/
verb
  1. 1

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

  2. 2

    (specifically) To defecate on, to soil with excrement.

  3. 3

    To stain or mar (for example with infamy or disgrace).

  4. 4

    To entangle or run against so as to impede motion.

Source: https://en.wiktionary.org/wiki/befoul, https://en.wiktionary.org/wiki/befouling