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Past participle: diphthongised
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|Verb||1.||diphthongise - change from a simple vowel to a diphthong; "This vowel diphthongized in Germanic"|
switch, change, shift - lay aside, abandon, or leave for another; "switch to a different brand of beer"; "She switched psychiatrists"; "The car changed lanes"
break - undergo breaking; "The simple vowels broke in many Germanic languages"