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® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
How to use let drop in a sentence
No doubt he himself blew it into clear flame by his let-drop news of Claire's death.Rest Harrow | Maurice Hewlett