kill

From Middle English killen, kyllen, cüllen (“to strike, beat, cut”), of obscure origin. Cognate with Scots kele, keil (“to kill”).

Perhaps from unattested Old English *cyllan, from Proto-West Germanic *kwulljan, from Proto-Germanic *kwuljaną, from Proto-Indo-European *gʷelH- (“to throw, hit, hurt by throwing”).

Or, possibly a variant of Old English cwellan (“to kill, murder, execute”) (see quell).

Or, from Old Norse kolla (“to hit on the head, harm”), related to Norwegian kylla (“to poll”), Middle Dutch kollen (“to knock down”), Icelandic kollur (“top, head”); see also coll, cole).

Compare also Saterland Frisian källe (“to hurt”), Middle Dutch kellen (“to kill, hurt”), Middle Low German kellen, killen (“to ache strongly, cause one great pain”) (whence German Low German kellen, killen (“to hurt, injure, torment, vex”)), Middle High German kellen (“to torment; torture”).