v. To free (someone) of a misconception or misapprehension; to unveil a falsehood held by (somebody).
the GNU version of the Collaborative International Dictionary of English
v. To set free from mistakes; to undeceive; to disengage from fallacy or deception; to set right; -- often used with of.
The Century Dictionary and Cyclopedia
To free from mistake; undeceive; relieve from fallacy or deception; set right: as, it is our duty to disabuse ourselves of false notions and prejudices.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
v. free somebody (from an erroneous belief)
Word Usage
"This talent to disabuse is in large part the obverse of Coward’s capacity for shrewd self-assessment."