sir
1
used as a respectful or polite way of referring to or addressing a man
- The receptionist asked, "How may I assist you, sir?"
- He addressed the guest speaker as sir during the interview.
- "Please wait here, sir," the attendant said, pointing to the seat.
- Sir, may I offer you some assistance with your luggage?
- The young man showed great respect when addressing his elders as sir.
2
a title used before the name of knight or baronet