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Verb: diphthongise  'dif,thóng,Iz or 'dip,thóng,Iz
Usage: Brit (N. Amer: diphthongize)
  1. Change from a simple vowel to a diphthong
    "This vowel diphthongised in Germanic";
    - diphthongize

Derived forms: diphthongising, diphthongises, diphthongised

Type of: change, shift, switch