disabuse

ˌdɪsəˈbjuːz

verb

persuade (someone) that an idea or belief is mistaken.

he quickly disabused me of my fanciful notions

disillusion,undeceive,correct,set right/straight,open the eyes of,enlighten,reveal the truth to,wake up,disenchant,shatter the illusions of,make sadder and wiser