back•lightPronunciation: (bak'līt"), [key]
—n., v., -light•ed or -lit, -light•ing.
Motion Pictures, Television.
a light source placed behind an actor, object, or scene to create a highlight that separates the subject from the background.
to illuminate (something) from behind.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.