jockey (n.) Look up jockey at
"person who rides horses in races," 1660s, a specific use of the earlier sense "boy, fellow" (1520s), which is a special use of the Scottish proper name Jockey, a familiar or diminutive form of Jock. Jockey-boots are from 1680s; jockey-shorts "abbreviated underwear for men" is from 1935 (jockey-briefs from 1946).
jockey (v.) Look up jockey at
1708, "trick, outwit, gain advantage," from jockey (n.) perhaps in its former secondary sense of "horse trader" (1680s) and reflecting their reputation. Meaning "to ride a horse in a race" is from 1767. Related: Jockeyed; jockeying.