misarticulate

/ˌmɪsɑrˈtɪkjəˌleɪt/
verb
  1. To speak or pronounce words unclearly or incorrectly.
    • When nervous, he often misarticulates his words and stumbles over sentences.
    • The toddler tends to misarticulate certain sounds like 'r' and 'l'.
    • The speech therapist helped the student stop misarticulating the 'th' sound.
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