diphthongize in English

verb
1
change (a vowel) into a diphthong.
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.
verb
    diphthongise

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