burst (someone's) bubble

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.
See also: bubble, burst

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.
See also: bubble, burst