disabuse

From Middle French désabuser, or dis- +‎ abuse.

• (UK) IPA^(key): /dɪsəˈbjuːz/

disabuse (third-person singular simple present disabuses, present participle disabusing, simple past and past participle disabused)

1. (transitive) To free (someone) of a misconception or misapprehension; to unveil a falsehood held by (somebody).
   • 1994, Nelson Mandela, Long Walk to Freedom, Abacus 2010, p. 140:

     If we had any hopes or illusions about the National Party before they came into office, we were disabused of them quickly.

• undeceive

• subideas