let it lay
Also, leave her lay. Allow it to rest; leave it alone. For example, Don't discuss their gift anymore; let it lay. The use of her in the variant is a slangy version of “it.” [Slang; first half of 1900s]
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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.