1. reveal secrets by indiscreet talk:informal"she blabbed to the press"Similartalkgive the game/show awayopen one's mouthtellinformal:let the cat out of the bagspill the beansblow the gaffcoughblurt outlet sliplet outtellrevealbetraydisclosegive awaydivulgeleaktake/blow the lid offblow something wide openinformal:let onspillOppositekeep quietkeep something to oneself
noun
1. a person who blabs:"Sam should not have gone soft on a blab who squealed"
Word OriginMiddle English (as a noun): probably of Germanic origin; ultimately imitative.