/tooh'twah yay"/ ; Fr. /tyuu twann yay"/ , v.t., tutoyered or tutoyed /-twah yayd"/ , tutoyering /-twah yay"ing/ .
to address (someone), esp. in French, using the familiar forms of the pronoun "you" rather than the more formal forms; address familiarly.
[ 1690-1700; tu and toi (the familiar sing. forms for "you" in French) ]