formal to persuade someone that something that they believe is not true
He said he thought that all women liked babies but I soon disabused him of that notion.
phrasedisabuse of disabuse sb of sthformal to persuade someone that something they believe is untrue: I was under the impression that my essay was rather good, but the professor soon disabused me of that notion.
disabuse (someone or oneself) of (something)
To stop someone or oneself from continuing to believe something that is false. After being so ill, I had to disabuse myself of the notion that work is more important than my health.
disabuse someone of something
to rid someone of an incorrect idea. Please allow me to disabuse you of that assumption.Please disabuse yourself of the notion that you are perfect.