ab·laut /ˈɑblaʊt, ˈæ; ˈɑpˌlaʊt/
母音變換
Ab·laut n. Philol. The substitution of one root vowel for another, thus indicating a corresponding modification of use or meaning; vowel permutation; as, get, gat, got; sing, song; hang, hung.
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ablaut
n : a vowel whose quality or length is changed to indicate
linguistic distinctions (such as sing sang sung song)