at length◼◼◼(for a long time) preposition [UK: ət leŋθ] [US: ət ˈleŋkθ]
parler longuementverbe
expatiate [expatiated, expatiating, expatiates](to write or speak at length; to be copious in argument or discussion, to descant) verb [UK: ɪk.ˈspeɪ.ʃɪeɪt] [US: ɪk.ˈspeɪ.ʃɪeɪt]