burst (one's) bubble(redirected from burst their 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!
burst someone's bubble
Fig. to destroy someone's illusion or delusion; to destroy someone's fantasy. I hate to burst your bubble, but Columbus did not discover Canada. Even if you think I am being foolish, please don't burst my bubble.