crush (someone's) dreams

Translations
разрушить (чьи-то) мечты
He didn't mean to crush her dreams, but he had to be honest about the challenges.
Он не хотел разрушать её мечты, но должен был честно рассказать о трудностях.
Definitions
To destroy someone's hopes or aspirations, often by revealing harsh realities or providing discouraging feedback.