undoctor

un- +‎ doctor

undoctor (third-person singular simple present undoctors, present participle undoctoring, simple past and past participle undoctored)

1. (transitive) To divest of the character or status of a doctor.
   • July 15, 1833, Jane Carlyle, letter to Thomas Carlyle

     My brother-in-law is a paragon of the class, but he is so by—in as much as possible—undoctoring himself.

2. (transitive) To restore (something illicitly altered) to its correct form.
   • 2012, William L. DeAndrea, Killed in the Act:

     If their accountants are undoctoring the books properly, there's evidence he's ripped off something close to two million bucks on this Arizona thing alone.