Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: blabber 'person who talks too much' (16-21 centuries) (from blab) + mouth

blabbermouth

 noun
     
blab‧ber‧mouth [countable]
informal someone who tells secrets because they always talk too much
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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