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

1935–40, Americanism; blabber + mouth

gossip, gossipmonger, busybody, talebearer, bigmouth, tattler. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
blabbermouth (ˈblæbəˌmaʊθ)
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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Example sentences
In fact, clever attackers combine trusted input risks with blabbermouth error-reporting to exploit software.
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