let drop

let drop idiom
Also, let fall. Utter a word or hint, either casually or inadvertently. For example, He let drop the fact that he'd decided to run for office, or She let fall some bits of gossip about the other teachers. [Late 1500s]

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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