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let daylight through or into

Shoot or stab a person, especially fatally. For example, Stick up your hands or I'll let daylight through you. This idiom alludes to making a hole in someone's body. [Slang; early 1700s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.