shatter (someone's) illusions

Translations
разрушить (чьи-то) иллюзии
The reality of the situation soon shattered his illusions about the job.
Реальность ситуации вскоре разрушила его иллюзии о работе.
Definitions
To confront someone with the harsh reality or truth that contradicts their beliefs or expectations, thereby causing them to lose their naive or idealistic views.
Words
illusion

noun
иллюзия
shatter

verb
разбить