{formal} How are you? - Usually as a reply to an introduction; it is in the form of a question but no answer is expected. * /"Mary, I want you to meet my friend Fred. Fred, this is my wife, Mary." "How do you do, Mary?" "How do you do, Fred?"/
HOW DO YOU DO
Meaning of HOW DO YOU DO in English
Dictionary of English idioms . Словарь английских идиом. 2012