labialize

/ˈleɪbiəlaɪz/
verb
  1. To pronounce a sound using the lips, or to change a sound so that it is pronounced with the lips.
    • In some dialects, speakers labialize the 'th' sound, making it sound more like 'f'.
    • Linguists study how children naturally labialize certain consonants as they learn to speak.
    • The teacher explained that we labialize the 'p' sound by pressing our lips together.
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