bust (one's) bubble(redirected from busts their bubble)
bust (one's) bubble
To bring someone back to reality, especially if they are dreaming or fantasizing about something unrealistic. An informal variant of "burst one's bubble." Look, I hate to bust 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.