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ab·laut

ablaut

 
pronunciation:
ab laUt
part of speech: noun
definition: a pattern of changes in sounds, usually vowels, that indicate variations in tense, number, person, or the like, as in "sink," "sank," and "sunk".
The verbs "sing" and "drink" have the same ablaut, as can be seen in the similarity of "sung" and "sang" to "drunk" and "drank."