American English

Definition of sir noun from the Oxford Advanced American Dictionary

      

    sir

     noun
    noun
    NAmE//sər//
     
     
    jump to other results
  1. 1 used 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. 3 Sir 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)
     
    jump to other results
    certainly not We will never allow that to happen! No sir!
    yes sir!, yes siree!
     
    jump to other results
    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