The compound noun "strikeout" is a transparent formation from the verb "strike" and the adverb "out," originating in the specific jargon of American baseball in the mid-19th century. The verb "strike," with its Old English origins meaning to hit or stroke, was naturally applied to the batter's swing at the pitched ball. The adverbial particle "out," from Old English ūt, was used in various games to signify elimination or failure. The logic of the term is perfectly literal: a batter who "strikes" (swings and misses or lets a good pitch pass) three times is ruled "out." This concrete sporting term has since extended metaphorically into general use to denote any notable failure or unsuccessful endeavor, preserving the core idea of being eliminated from contention.

Structure: strike + out - strike (Old English strīcan, meaning "to go, move, stroke"). Functional role: The core verb root denoting the act of swinging at the ball. - out (Old English ūt, meaning "out, outside"). Functional role: An adverbial particle indicating the result or state of being eliminated from play.