diphthongize

Từ điển WordNet v3.1 - WordNet Dictionary

verb

change from a simple vowel to a diphthong
- This vowel diphthongized in Germanic
• Syn:
diphthongise
• Derivationally related forms:
diphthong
• Hypernyms:
switch, shift, change
• Hyponyms:
break
• Verb Frames:
- Something ----s