Vousvoyer

The much thornier problem of whether to vousvoyer or tutoyer Ahmadou solved itself. At first I sought refuge in the impersonal on ("Can one have a glass of water, please?" instead of "Please bring me a glass of water.") But Ahmadou was soon tutoyer-ing me as often as vousvoyer-ing me, although he continued to use the formal "Monsieur," so I came to use the familiar form in addressing him.

Source: wiktionary

It was typical that once I learned to speak French, I could tutoyer both men, though they formally “vousvoyered” each other.

Source: wiktionary

It irritated her that since the bedroom incident he presumed to tutoyer her. She always took care to vousvoyer him back. With icy politeness.

Source: wiktionary

As for vousvoyer'''ing the help, Mahouna has tutoyéed me from the beginning.

Source: wiktionary