American English

Definition of sir noun from the Oxford Advanced American Dictionary



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  1. 1used as a polite way of addressing a man whose name you do not know, for example in a store or restaurant, or to show respect Good morning, sir. Can I help you? Are you ready to order, sir? “Report to me tomorrow, corporal!” “Yes, sir!” “Thank you very much.” “You're welcome, sir. Have a nice day.” compare ma'am see also madam
  2. 2Dear Sir/Sirs used at the beginning of a formal business letter when you do not know the name of the man or people that you are dealing with Dear Sir/Sirs Dear Sir or Madam
  3. 3Sir a title that is used before the first name of a man who has received one of the highest British honors (= a knight ), or before the first name of a baronet Sir Paul McCartney Thank you, Sir Paul. compare lady
  4. Idioms
    no sir!, no siree! (informal)
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    certainly not We will never allow that to happen! No sir!
    yes sir!, yes siree!
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    used to emphasize that something is true That's a fine car you have. Yes sir!
See the Oxford Advanced Learner's Dictionary entry: sir