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burst bubble
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.
burst somebody's bubble
also burst the bubble of somebody to tell someone unexpected bad news I don't want to burst her bubble by telling her we won't have a vacation this summer. He tries to burst the bubble of anyone who believes population growth is not a problem.