vouvoyer

— [Guy] Bertrand said he should also have twigged when “Bouchard” – whom he has addressed using the familiar “tu” for years – started off the conversation using the formal “vous.” “I found myself saying, ‘Hello, Lucien, how is it going?’ and he ‘vouvoyered’ me and he had a bit of a haughty air. So I told myself that even though we know each other well, perhaps it’s better if we use vous.”