To blab is to gossip about or reveal a secret you promised to keep. You might accidentally blab to your dad about your brother getting in trouble at school.

A reporter could take you by surprise and get you to blab about your movie star neighbor, and it might be hard for a little kid not to blab about the birthday gift he's giving his sister. Another way to blab is simply to talk a lot: "I sat there and listened to him blab about all the famous people he knows." Blab comes from the Middle English blabbe, "one who does not control his tongue."

Definitions of blab

v speak (about unimportant matters) rapidly and incessantly

blabber, chatter, clack, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle
babble, blather, blether, blither, smatter
to talk foolishly
Type of:
mouth, speak, talk, utter, verbalise, verbalize
express in speech

v divulge confidential information or secrets

babble, babble out, blab out, let the cat out of the bag, peach, sing, spill the beans, talk, tattle
spill, talk
reveal information
keep one's mouth shut, keep quiet, shut one's mouth
refrain from divulging sensitive information; keep quiet about confidential information
Type of:
break, bring out, disclose, discover, divulge, expose, give away, let on, let out, reveal, unwrap
make known to the public information that was previously known only to a few people or that was meant to be kept a secret

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