Other Word Forms of Sour
Origin of Sour
From Middle English sour, from Old English sÅ«r (“sour"), from Proto-Germanic *sÅ«raz (“sour"), from Proto-Indo-European *sÅ«r- (“sour (milk)"). Cognate with West Frisian soer, Dutch zuur (“sour"), Low German suur, German sauer (“sour"), Danish and Swedish sur (“sour"), French sur (“sour"), Icelandic súr (“sour, bitter").
Middle English from Old English sūr
From American Heritage Dictionary of the English Language, 5th Edition
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