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Phrase(s): What brings you here?
Fig. What is your reason for being here? (A polite request for this information. More polite than "Why are you here?") • Tom: Hello, Mary. What brings you here? Mary: I was invited, just like you. • Doctor: Well, John, what brings you here? John: I’ve had this cough for nearly a month, and I think it needs looking into.
McGrawhill's American Idioms And Phrasal Verbs