From Middle English axel, axle, eaxle, from Old English eaxl ("shoulder, armpit"), from Proto-West Germanic *ahslu ("shoulder"), from Proto-Germanic *ahslō ("shoulder"), from Proto-Indo-European, from *h₂eḱs-. Cognate with Saterland Frisian acsle ("shoulder"), Dutch oksel ("armpit"), German Achsel ("armpit"), Swedish axel ("shoulder"), Latin axilla ("armpit"), Latin axis ("axle"),