have a big mouth
Slang Dictionary

have a big mouth definition


  1. tv.
    to speak loudly and openly in public; to tell secrets. (Have got can replace have.) : He has a big mouth. Don't tell him anything you don't want everybody else to know.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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Have a big mouth is always a great word to know.
So is ninnyhammer. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a fool or simpleton; ninny.
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American Heritage
Idioms & Phrases

have a big mouth

see big mouth.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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