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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.
American Heritage Idioms
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Phrase(s): shed (some) light on something [and] throw (some) light on something
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.
McGrawhill's American Idioms And Phrasal Verbs