Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: blab 'person who talks too much, too much talk' (14-20 centuries), probably from the sound

blab

 verb
     
blab past tense and past participle blabbed, present participle blabbing [intransitive] informal
to tell someone something that should be kept secret
blab to
Don't go blabbing to your friends about this.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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