how do you do
成語所屬單字how
how do you do — 慣用語
1. A formal greeting used when meeting someone for the first time, usually answered
1.慣用語
釋義
你好（初次見面用語）
A formal greeting used when meeting someone for the first time, usually answered with the same phrase.
例句
How do you do? I'm pleased to meet you.
When introduced, they both said, "How do you do?" politely.