📚 Diphthongize, verb. ❓ Definition (with object): Change (a vowel) into a diphthong. ❗️ Examples: 1. The short vowel was not lengthened or diphthongized. 2. But at normal conversational speed its ghastly sequence of four diphthongized long vowels (in the nicely symmetrical but un-IPA Trager-Smith transcription, / ay ey iy ey /) sounds something like ah-ee-yay-ee-yee-yay-ee. 3. Stealth has a long, tense, diphthongized high vowel [i], whereas stealth has a short, lax, mid-vowel. 4. In particular, the vowel of the last syllable was a pretty good IPA [e], not diphthongized like the vowel in English babe but also not laxed and shortened like the vowel in English bed. ━━━━━━━━━━━━━ 🌀 @cambridge_dic