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a big mouth
1. A tendency or habit of speaking incessantly and indiscreetly, especially about sensitive or secret information. If I'd known you had such a big mouth, I'd have never shared my secret with you! God you've got a big mouth! Don't you ever stop talking about other people's business? Of course Bobby let it slip that there would be a surprise party for her birthday—that kid's got a big mouth.
2. A person who talks in such a manner. I can't stand Terry's new husband, he is such a big mouth! Now I'm in trouble, thanks to you being a big mouth and blabbing all about how I got home past curfew last night! We would have gotten away with the plan if she hadn't been such a big mouth!
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
1. n. a person who talks too much or too loudly; someone who tells secrets. (Also a term of address.) Okay, big mouth! Shut up!
2. tv. to spread secrets around. Why do you always have to big mouth everything around?
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.