step on (someone's) dreams

Translations
разрушать (чьи-то) мечты
I don't want to step on her dreams, but she needs to be realistic.
Я не хочу разрушать её мечты, но ей нужно быть реалисткой.
Definitions
To discourage, undermine, or prevent someone from achieving their goals or aspirations, often by being dismissive, critical, or unsupportive.