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Sir
01
used as a respectful or polite way of referring to or addressing a man
02
a title used before the name of knight or baronet
sir
n
Example
May I take your coat and hat, sir?
I'm sorry for bringing you the wrong order, sir, I've had my wires crossed all day!
I think Lady Westerly took umbrage with your remarks, sir.
With all due respect sir, your plans are nothing but a castle in the air at this stage.