Ithe definitions

(obsolete) A wave.
noun
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(obsolete, in the plural) Waves; the sea.
noun
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(obsolete, intransitive) To thrive; flourish; prosper.
verb
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Origin of ithe

From Middle English ithe, ythe, uthe, from Old English ȳþ (“wave, billow, flood, sea, liquid, water”), from Proto-Germanic *unþiz, *unþijō (“wave”), from Proto-Indo-European *unt-, *und- (“wave”), perhaps from Proto-Indo-European *awe-, *aw- (“to water, wet, moisten, flood”). Cognate with German Unde (“flood, wave”), Icelandic unnur (“wave”), Latin unda (“wave”).