tutoyer

verb

1. (transitive)To address (someone) in French using the familiar second-person pronoun tu; to thou.

   “As I had begged Goethe to tutoyer me, he sent me a message to say, I must really remain more than the two days I had named, otherwise he should never get into the way of doing so.”

   “[…] Corporal Cornichon, walking straight up to the bar, "tutoyering" me all the time in the most horridly familiar manner, clapped me on the back, and asked me to take a glass of cognac with him.”