to free someone from a misconception or misapprehension of something; to unveil a falsehood
If you disabuse someone of something, you tell them or persuade them that what they believe is in fact untrue. Their view of country people was that they like to please strangers. I did not disabuse them of this notion. to persuade someone that what they believe is not true disabuse sb of sth (dis- + ABUSE (15-18 centuries))
To set free from mistakes; to undeceive; to disengage from fallacy or deception; to set right