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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
To disprove, ruin, or eliminate someone's fantasy, delusion, misbelief, or recent happiness. Sorry to burst your bubble, Janet, but Sarah only went out on a date with you to make Suzie jealous. I'm happy you won, and I don't mean to burst your bubble while you're celebrating, but your opponent could use some encouragement.
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.