undervoice /ˌʌndə(ɹ)ˈvɔɪs/verb 2/ˈʌndə(ɹ)ˌvɔɪs/ noun 1forms 3 verb2 •To voice too weakly.Consequently, the danger for Dutch learners of English is undervoicing the English lenis fricatives rather than the reverse. — 1984 •To make a quieter or background sound beneath.Undervoicing the flame, there was the popping of hollow weed stalks, the tinkle of woody stems crisping and falling in coals. — 1902 undervoice /ˈʌndə(ɹ)ˌvɔɪs/ noun1 •A low or quiet voice.Brayder introduced them to one or two of the men, hastily and in rather an undervoice, as a thing to get over. — 1859 formsundervoiced · undervoicing · undervoices