- a loud, talkative person, especially one who lacks discretion.
- any of several fishes having an unusually large mouth.
Origin of bigmouth
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- slang a noisy, indiscreet, or boastful person
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
Word Origin and History for big mouth
Online Etymology Dictionary, © 2010 Douglas Harper