unvoice

/ʌnˈvɔɪs/
verb
  1. To pronounce a speech sound without vibration of the vocal cords; to devoice.
    • In some dialects, speakers unvoice the final 'd' so it sounds like a 't'.
    • When he whispered, he tended to unvoice all the vowels as well.
    • Linguists study how certain languages unvoice consonants at the end of words.
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