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.

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