From Middle English quellen, from Old English cwellan ("to kill"), from Proto-Germanic *kwaljaną ("to make die; kill"). Cognate with German quälen ("to torment; agonise; smite"), Swedish kvälja ("to torment"), Icelandic kvelja ("to torture; torment"). Compare also Old Armenian կեղ ("sore, ulcer"), Old Church Slavonic жаль ("pain"). See also kill, which may be its doublet.
From Middle English *quelle (suggested by the verb quellen), from Old English cwylla, *cwielle, from Proto-Germanic *kwellǭ ("well; spring"). Compare German Quelle.
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