1
general::
Leave hastily, run away, as in Here comes the teacher? let's light out. This slangy idiom may allude to the nautical sense, that is, to move or lift anything along. [Slang; mid-1800s]
American Heritage Idioms
2
general::
Phrase(s): light out (of some place) (for some place)
Fig. to leave a place in a great hurry for some place. • I lit out of there for home as fast as I could. • I lit out of there as fast as I could go., Phrase(s): light out (for some place)
Go to cut out (for some place).
McGrawhill's American Idioms And Phrasal Verbs