APOPHONY
- (in Indo-European languages) regular alternation in the internal phonological structure of a word element, esp. alternation of a vowel, that is coordinated with a change in grammatical function or combination, as in English sing, sang, sung, song;
- ablaut (a patterned change in root vowels of verb forms) [n APOPHONIES]
- a change in root vowels of verb forms [n APOPHONIES]
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