"arrangement," 1890, from verbal phrase set up, attested from c. 1200 as "to make ready for use" and from 1950 (in pugilism) as "to bring (someone) to a vulnerable position;" from set (v.) + up (adv.). The verbal phrase also can mean "to establish" (early 15c.) and "put drinks before customers" (1880).[set-up etymology, set-up origin, 英语词源]