v. [UN-2 4.] trans. To deprive of voice; spec. in Phonetics, to utter with breath in place of voice.
1637. N. Whiting, Albino & B., 402. As though an Incubus Enclaspt their bosomes, and un-voycd their tongues. Ibid., 702.
1879. Sweet, Coll. Papers (1913), 456. In Russian, as in French, a high final vowel is often unvoiced after a breath stop. Ibid. (1888), Eng. Sounds, 19. Liquids and nasals are not often unvoiced.
Hence Unvoicing vbl. sb.
1887. Skeat, Eng. Etym., Ser. I. 392. Unvoicing of voiced consonants.
1888. Sweet, Eng. Sounds, 198. This unvoicing of weak stops.