to pronounce (a simple vowel) as a diphthong
to become a diphthong
tr. & intr.v.diph·thong·ized, diph·thong·iz·ing, diph·thong·iz·es
To pronounce as or become a diphthong.
(third-person singular simple present diphthongizes, present participle diphthongizing, simple past and past participle diphthongized)
- (phonetics) to change to a diphthong (as by inserting or removing a vowel)
- (intransitive, phonetics) to become a diphthong
diphthong + -ize