bigmouth

[big-mouth]

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 + mouth
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for bigmouth

bigmouth

noun

slang a noisy, indiscreet, or boastful person
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