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[big-mouth] /ˈbɪgˌmaʊθ/
noun, plural bigmouths
[big-mouth z, -mouths] /ˈbɪgˌmaʊðz, -ˌmaʊθs/ (Show IPA),
for 1; (especially collectively) bigmouth (especially referring to two or more kinds or species) bigmouths for 2.
a loud, talkative person, especially one who lacks discretion.
any of several fishes having an unusually large mouth.
Origin of bigmouth
An Americanism dating back to 1885-90; big1 + mouth Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for big mouth
Contemporary Examples
Historical Examples
  • The lines about his big mouth hardened with grim determination.

    Out of the Depths

    Robert Ames Bennet
  • Again his hand went to his beard and his big mouth opened in meditation.

    The Book of All-Power Edgar Wallace
  • Suddenly he opened his big mouth and then closed it with a snap.

    Mother West Wind's Children

    Thornton W. Burgess
  • "You are hungry," he said, as he expanded his big mouth and grinned pleasantly.

    The Call Of The South Louis Becke
  • And Old Bender was pokin' around, and his wife and the boy with the big mouth.

    Mitch Miller Edgar Lee Masters
  • They named it gulosus, "large-mouthed," owing to its big mouth.

    Bass, Pike, Perch, and Others James Alexander Henshall
British Dictionary definitions for big mouth


(slang) a noisy, indiscreet, or boastful person
Derived Forms
big-mouthed, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for big mouth

also bigmouth "person who talks too much," 1889, American English, from big + mouth (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for big mouth



  1. A person who talks constantly and loudly
  2. A person who freely announces personal opinions and judgments; know-it-all, smart-ass
  3. A person who can't keep a secret (1880s+)

Related Terms

have a big mouth

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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