burst somebody's bubble
burst (one's) bubble
To bring someone back to reality, especially if they are dreaming or fantasizing about something unrealistic. Look, I hate to burst your bubble, but there is no way you're getting into Harvard! You're a C student!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
ˌburst somebody’s ˈbubblebring an end to somebody’s hopes, happiness, etc: Things are going really well for him. I just hope nothing happens to burst his bubble.
Farlex Partner Idioms Dictionary © Farlex 2017