Definition of rückumlaut
: the absence of umlaut of the stem vowel in the past tense and past participle of some Germanic weak verbs as a result of the loss of i in the following syllable before the umlaut period
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Origin and Etymology of rückumlaut
German literally, back umlaut, from rück- (from zurück back, backward, from Middle High German ze rücke, from ze to—from Old High German zi—+ rücke back, from Old High German hrukki) + umlaut
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