The Collaborative International Dictionary of English v.0.48:

jacklight \jacklight\ n.
   A portable source of light, as an oil lantern or electric
   light, used as a lure for hunting at night.

   Syn: jack.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

jacklight \jacklight\ v. t.
   to fish for or hunt with a jacklight.

   Syn: jack.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

jacklight
    n 1: a light used as a lure in hunting or fishing at night
    v 1: hunt with a jacklight [syn: jacklight, jack]