What is the meaning of Ablaut?

The substitution of one root vowel for another, thus indicating a corresponding modification of use or meaning; vowel permutation, distinct from the phonetic influence of a succeeding vowel.

To undergo a change of vowel.

To cause to change a vowel.

ablaut

ablaut

ablaut (substitution of one root vowel for another)

ablaut

ablaut (substitution of one root vowel for another)

ablaut

ablaut (substitution of one root vowel for another)

Source: wiktionary.org