used when speaking to a man in order to be polite or show respect: ➔ madam (1) British English ➔ ma'am American English
'Report back to me in an hour, sergeant.' 'Yes, sir.'
Can I help you, sir?
Sir! You dropped your wallet.
used at the beginning of a formal letter to a man or to people you do not know
a title used before the first name of a knight or baronet:
Sir Paul McCartney
4 British English spoken
used by children at school when speaking to or talking about a male teacher: ➔ miss2 (4)
Sir, I've forgotten my homework.
Look out - sir's coming back!
5 also no/yes siree! especially American English old-fashioned spoken
used to emphasize a statement or an answer to a question:
I will not have that man in my home, no sir!