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Phrase(s): How do you do.
a standard inquiry and response on greeting or meeting someone. (This expression never has rising question intonation, but the first instance of its use calls for a response. Sometimes the response does, in fact, explain how one is.) • Sally: Hello. How do you do. Bob: How do you do. • Mary: How do you do. So glad to meet you, Tom. Tom: Thank you. How are you? Mary: Just fine. Your brother tells me you like camping. Tom: Yes. Are you a camper? Mary: Sort of.
McGrawhill's American Idioms And Phrasal Verbs