Fig. to reveal something about something; to clarify something. (Also with any.) This discussion has shed some light on the problem. Let's see if Ann can throw any light on this question.
to make something clearer Experts hope the plane's flight recorders will shed light on the cause of the crash.The latest study could throw light on why older people are the only ones affected.
Also, throw light on. Clarify or explain, as in I was hoping the professor would shed light on how he arrived at his theory, or Can anyone throw some light on where these plants came from? Originally, from about 1200, these expressions were used literally, in the sense of "illuminate," but they soon were used figuratively as well.