sir

"The officer addressed the soldier as 'sir' during the ceremony."

"Yes, sir, I will get that report to you by the end of the day."

"The waiter greeted the guest with a polite, 'How can I assist you, sir?'"

"The employee was instructed to sir the clients as a sign of respect."

"She decided to sir her professor in every correspondence."

"When in doubt, it’s best to sir the audience in your speech."