The compound adjective "three-hit" is a modern formation following the productive English pattern of number-noun compounding. The first element, "three," traces its lineage back to the Proto-Indo-European root tréyes, a fundamental numeral that evolved into its Germanic and subsequently Old English forms. The second element, "hit," originates from the Old Norse verb hitta, meaning to find or meet, which was adopted into Middle English with the sense of striking a target. In the specific jargon of baseball, "hit" became a technical noun for a batted ball allowing safe passage to a base. The fusion of these two elements creates a transparent, literal descriptor for achieving three such successes in a game, a meaning later extended metaphorically to other fields like entertainment to denote a triple success.

Structure: three (number) + hit (strike) - three: From Old English þrīe, þrēo, from Proto-Germanic þrīz, from Proto-Indo-European tréyes. Functions as a numerical quantifier. - hit: From Old English hyttan (to meet with, come upon), from Old Norse hitta (to meet, hit upon). Functions as the core noun/verb denoting a successful strike or impact.