WordReference Random House Learner's Dictionary of American English © 2017
dis•a•buse /ˌdɪsəˈbyuz/USA pronunciation   v. [+ object + of + object], -bused, -bus•ing. 
  1. to free (someone) from deception or error:Let me disabuse you of that foolish idea.

WordReference Random House Unabridged Dictionary of American English © 2017
dis•a•buse  (dis′ə byo̅o̅z),USA pronunciation v.t.,  -bused, -bus•ing. 
  1. to free (a person) from deception or error.
dis′a•busal, n. 
  • French désabuser. See dis-1, abuse
  • 1605–15

Collins Concise English Dictionary © HarperCollins Publishers::

disabuse /ˌdɪsəˈbjuːz/ vb
  1. (transitive) usually followed by of: to rid (oneself, another person, etc) of a mistaken or misguided idea; set right

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