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 (substitution of one root vowel for another)

ablaut (substitution of one root vowel for another)

ablaut

ablaut (substitution of one root vowel for another)

Source: wiktionary.org