cornerback

the term is a modern american english compound, formed from two ancient nouns to describe a specific sporting position. 'corner' derives from the latin 'cornu', meaning a horn or projecting point, which evolved in english to signify the place where two converging lines or surfaces meet. 'back' originates from the old english 'bæc', referring to the rear part of the human body, and was extended in sports terminology to denote a player in a defensive position. when combined in the early 20th century for american football, the compound logically describes a defensive player stationed at the projecting edge or angle of the defensive formation.

Structure: corner (noun) + back (noun) corner: from latin 'cornu' (horn, projecting end), via anglo-french 'cornere'. functions as a noun denoting a place or angle. back: from old english 'bæc'. functions as a noun denoting a position or player in a defensive rear area.