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blabbermouth

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blabbermouth/ˈblæbɚˌmaʊθ/noun
pluralblabbermouths
blabbermouth
/ˈblæbɚˌmaʊθ/
noun
pluralblabbermouths
Learner's definition of BLABBERMOUTH  
[count]informal
: someone who reveals secrets or talks too much
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