Definition of blab in English:

blab

Syllabification: blab
Pronunciation: /blab
 
/
informal

verb (blabs, blabbing, blabbed)

[no object]
  • Reveal secrets by indiscreet talk: she blabbed to the press [with object]: there’s no need to blab the whole story
    More example sentences
    • She can't go blabbing out secrets after the third round of drinks.
    • Apparently, he had blabbed out to the whole school that Sean was my boyfriend.
    • That's how long it had been since he'd blabbed about the whole movie theater incident.

noun

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  • A person who blabs.
    More example sentences
    • Anyhoo, it annoys me when the blabs plump for the same stuff.
    • We thought it was a good deal; Grandma could smoke her cigars in Edith's face and catch up on all the daily gossip since Edith was a big blab.

Origin

Middle English (as a noun): probably of Germanic origin; ultimately imitative.

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a small amount; a little