American spelling: the present participle of diphthongize; the action of currently changing vowels into diphthongs.
From 'diphthongize' + '-ing' (present participle). This form describes the active, ongoing process of vowel transformation using American English verb conjugation.
Linguists studying American regional accents are finding that diphthongizing is happening at different rates in different places—Southern American English is diphthongizing vowels faster than other regions!
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