blab /blæb/ BrE AmE verb ( past tense and past participle blabbed , present participle blabbing ) [intransitive] informal
[ Date: 1500-1600 ; Origin: blab 'person who talks too much, too much talk' (14-20 centuries) , probably from the sound ]
to tell someone something that should be kept secret SYN gossip
blab to
Don’t go blabbing to your friends about this.