ABLAUT is validvalid

a patterned change in root vowels of verb forms

14,948 of 196,601 in NWL2023·also valid in CSW24

(German) vowel change in related words, esp. that in Indo-European, which survives in English in e.g. sing, sang, sung, song

342 of 280,887 in CSW24·also valid in NWL2023

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