v. [UN-2 4.] trans. To deprive of voice; spec. in Phonetics, to utter with ‘breath’ in place of ‘voice.’

1

1637.  N. Whiting, Albino & B., 402. As though an Incubus … Enclaspt their bosomes, and un-voyc’d their tongues. Ibid., 702.

2

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.

3

  Hence Unvoicing vbl. sb.

4

1887.  Skeat, Eng. Etym., Ser. I. 392. Unvoicing of voiced consonants.

5

1888.  Sweet, Eng. Sounds, 198. This unvoicing of weak stops.

6