Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Origin: dis- + ABUSE2 'to deceive' (15-18 centuries)

disabuse

 verb
     
dis‧a‧buse [transitive] formal
to persuade someone that what they believe is not true
disabuse somebody of something
I tried to disabuse him of that notion.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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