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
American idioms English vocabulary. Английский словарь американских идиом. 2012