Deprave (v.) - to slander, depreciate, to distort.
Ther that meschief is gret, Mede may helpe.
And thow knowest, Conscience, I kam noght to chide,
Ne to deprave thi persone with a proud herte.
Wel thow woost, wernard, but if thow wolt gabbe,
Thow hast hanged on myn half ellevene tymes,
And also griped my gold, and gyve it where thee liked.
- Langland, William: The vision of Piers Plowman (1377-1379)
The Middle-English Word of the Day is selected from Mayhew and Skeat's
"Concise Dictionary of Middle English."
As found on Greg Lindahl's website
The example text was found at the Middle English Collection of the University of Virginia Library.