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Verb: diphthongize  'dif,thóng,Iz or 'dip,thóng,Iz
  1. Change from a simple vowel to a diphthong
    "This vowel diphthongized in Germanic";
    - diphthongise [Brit]

Derived forms: diphthongized, diphthongizes, diphthongizing

Type of: change, shift, switch