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.
- 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
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for big mouth
Derived Formsbig-mouthed, adjective
- slang a noisy, indiscreet, or boastful person
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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