A spotlight or lamp mounted on a car, boat or pole, etc. to aid in hunting.
It was a long, low roadster, with a jacklight.
To shine a jacklight or spotlight on an animal, usually a deer, to aid in hunting at night.
* 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 relat...
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