noun, plural motor-mouths [moh-ter-mouths, mouthz] . Slang.
a person who is a constant or irrepressible talker. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
motormouth (ˈməʊtəˌmaʊθ)
slang a garrulous person

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source's 21st Century Lexicon
Main Entry:  motormouth
Part of Speech:  n
Definition:  any person who talks non-stop and quite fast, esp. about inconsequential topics; also, the incessant chatter of this type of person
Example:  The 11-year-old is a motormouth about Pokemon.
Usage:  motormouth v's 21st Century Lexicon
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