diphthongize
v. 双重母音化；发音成双重母音
名词：diphthongization 过去式：diphthongized 过去分词：diphthongized 现在分词：diphthongizing 第三人称单数：diphthongizes
近义词：diphthongise，
英英释义
Verb
- change from a simple vowel to a diphthong;
"This vowel diphthongized in Germanic"