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Webster 1913 Edition
Mistutor
Mis-tu′tor
,Verb.
 T.
 To instruct amiss. 
Webster 1828 Edition
Mistutor
MISTU'TOR
,Verb.
T.
  Definition 2025
mistutor
mistutor
English
Verb
mistutor (third-person singular simple present mistutors, present participle mistutoring, simple past and past participle mistutored)
- (transitive) To tutor badly or amiss.