What does 'light' mean in the phrase?

Language is beautiful and, in many cases, continually evolving. As a result, we end up with hundreds of strange idioms and figures of speech that we use on a daily basis, with little to no understanding of what they originally meant. Join the guys with special guests Frank Mulherin and Rowan Newbie, the creator of the Pitches podcast, as they explore the bizarre origins of your favorite turns of phrase in this week's Classic episode.

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