light on

light on idiom
Also, light upon. Happen upon, come across, discover. For example, John was delighted to light on a new solution to the problem, or We were following the path when suddenly we lit upon a cave. [Second half of 1400s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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