blabbermouth

[blab-er-mouth]
noun, plural blabbermouths [blab-er-mouthz, -mouths] .
a person who talks too much, especially indiscreetly.

Origin:
1935–40, Americanism; blabber + mouth


gossip, gossipmonger, busybody, talebearer, bigmouth, tattler.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
blabbermouth (ˈblæbəˌmaʊθ)
 
n
informal a person who talks too much or indiscreetly

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Slang Dictionary

blabbermouth definition


  1. n.
    someone who talks too much and tells secrets. : You are such a blabbermouth!
  2. tv.
    to tell secrets in public. : Don't blabbermouth this to everybody.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
In fact, clever attackers combine trusted input risks with blabbermouth error-reporting to exploit software.
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