let it lay
Leave (something) alone; don't disturb (something). I felt compelled to press him further about his decision to drop out, but I decided to let it lay for the time being.
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]