befoul

[ bih-foul ]

/ bɪˈfaʊl /

to make dirty or filthy; soil; defile; sully: a bird that befouls its own nest.

Origin of befoul

First recorded in 1275–1325, befoul is from the Middle English word bi-foulen. See be-, foul

be·foul·er, noun be·foul·ment, noun

Adolf Hitler, despite being the most evil force ever to befoul mankind, was also a kind and conscientious employer.

Secrets of Nazi Secretaries |Andrew Roberts |August 30, 2011 |DAILY BEAST
He, the officer, must befoul his person and derange his hours of rest and recreation, that others may enjoy.

Shandygaff |Christopher Morley
Can anything be so bad as the living bush which bleeds and talks, or the Harpies who befoul Aeneas's dinner?

Life and Letters of Lord Macaulay |George Otto Trevelyan
Self-consciousness compels such creatures to befoul their origin.

The Remarkable History of Sir Thomas Upmore, bart., M.P., formerly known as "Tommy Upmore" |R. D. Blackmore

I could not prevent myself from saying, "Do you think it is nice to befoul your own nest?"

My Actor-Husband |Anonymous
They will close in on you tomorrow—you and all the dirty vermin that befoul these cliffs.

Wappin' Wharf |Charles S. Brooks

befoul

/ (bɪˈfaʊl) /

(tr) to make dirty or foul; soil; defile

befouler, noun befoulment, noun