subvocalise

/sʌbˈvoʊkəlaɪz/
verb
  1. To say words silently in your mind without moving your lips or making a sound, often while reading or thinking.
    • He subvocalised the lyrics of the song while waiting for the bus.
    • She tried not to subvocalise during the exam so she could finish faster.
    • Many people subvocalise when they read difficult texts to help them understand.
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