disabuse

From Middle French désabuser, or dis- +‎ abuse.

• (UK, General American) 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 (someone)
   • 1834, L[etitia] E[lizabeth] L[andon], Francesca Carrara. […], volume I, London: Richard Bentley, […], (successor to Henry Colburn), OCLC 630079698, page 201:

     I had been too profoundly disabused of life's dearest illusions ever again to allow of their sweet engrossment.

   • 1994, Nelson Mandela, Long Walk to Freedom, Abacus, published 2010, page 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