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Meaning of “sir” - Learner’s Dictionary

sir

noun     /sɜːr/
POLITE NAME ( also Sir)
B1 You call a man 'sir' when you are speaking to him politely: Excuse me, sir, is this seat taken?Names and titles
FORMAL LETTER
B2 You write 'Sir' at the beginning of a formal letter to a man when you do not know his name: Dear Sir, I am writing to...Names and titlesWritten greetingsLetters, notes and cards
Sir
a title used in the UK before the name of a man who has been officially respected or who has a high social rank: Sir Cliff RichardRoyalty, aristocracy and titles
(Definition of sir from the Cambridge Learner’s Dictionary © Cambridge University Press)
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