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  • jack +‎ light. Probably from jack (a male servant of any rank), later associated with a boy servant or any boy, and later still with a knave: a rogue, thief, or deceitful man.
  • Possibly also related to Spanish jaque (a bully).


jacklight (plural jacklights)

  1. A spotlight or lamp mounted on a car.
    • 1931, William Faulkner, Sanctuary, Library of America, 1985, p.19:
      It was a long, low roadster, with a jacklight.