diphthongize








verb (used with object), diph·thong·ized, diph·thong·iz·ing.

  1. to change into or pronounce as a diphthong.

verb (used without object), diph·thong·ized, diph·thong·iz·ing.

  1. to become a diphthong.

verb

  1. (often passive) to make (a simple vowel) into a diphthong
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