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See more synonyms for bigmouth on Thesaurus.com
noun, plural big·mouths [big-mouth z, -mouths] /ˈbɪgˌmaʊðz, -ˌmaʊθs/ for 1; (especially collectively) big·mouth, (especially referring to two or more kinds or species) big·mouths for 2.
  1. a loud, talkative person, especially one who lacks discretion.
  2. any of several fishes having an unusually large mouth.
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Origin of bigmouth

An Americanism dating back to 1885–90; big1 + mouth
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

blowhard, boaster, brag, braggart, gossiper, know-it-all, windbag, bragger, gasbag, grandstander, show-off, trumpeter

Examples from the Web for bigmouth

Historical Examples

  • Bigmouth buffalo were rare, and were taken only in quiet parts of larger streams, and in the borrow-pit at Station 6-S.

    Fishes of the Big Blue River Basin, Kansas

    W. L. Minckley

British Dictionary definitions for bigmouth


  1. slang a noisy, indiscreet, or boastful person
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Derived Formsbig-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