sotto voce UK /ˌsɒtəʊ ˈvəʊtʃeɪ/US /ˌsɑtoʊ ˈvoʊtʃi/adjective 2adverb 2noun 1forms 1 adjective2 •In soft tones; quiet.Then a man called for her, and began to make coarse jokes. But Mr. Pappleworth nodded his head in the direction of the boy, and the talk went on sotto voce. — 1913 •Soft, instruments or voice. adverb2 •Quietly.“Darling,” she says, “a working-class hero is something to be. “Of course,” she adds, sotto voce, “I wouldn’t know.” — 2007 •Sung or played softly, instruments or voice. noun1 •A direction in a score that a passage in a piece should be played softly, or sung in a low voice, when applied to vocal music. formssotto voci