jockey (n.) Look up jockey at Dictionary.com
1520s, "boy, fellow," originally a Scottish proper name, variant of Jack. The meaning "person who rides horses in races" first attested 1660s.
jockey (v.) Look up jockey at Dictionary.com
1708, "trick, outwit, gain advantage," from jockey (n.) perhaps from its former additional sense of "horse trader" (1680s). Meaning "to ride a horse in a race" is from 1767. Related: Jockeyed; jockeying.