The ongoing or continuous process of vowels becoming diphthongs, or the action of pronouncing something as a diphthong.
From 'diphthongize' (verb form) + '-ing' (ongoing action). This gerund captures the dynamic, continuous nature of the linguistic process where vowels transform over time.
In real-time, linguists can actually observe diphthonging happening—for example, younger Americans are increasingly diphthongizing vowels before certain consonants in ways their grandparents never did!
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