How do you do?

How do you do is defined as a polite greeting that you can use when first introduced to someone.

(idiom)

An example of "how do you do" is what you would say as you shake hands with someone you meet for the first time.

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See How do you do? in Webster's New World College Dictionary

how is your health?: a conventionalized expression used in greeting a person or upon being introduced

or how-d'-ye-do

noun

Informal an annoying or awkward situation: usually preceded by fine, pretty, nice, etc.
also how-de-do

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