Pronunciation: /ˈblæbərˌmaʊθ/
noun a person who talks excessively or indiscreetly
A1 My little sister is a blabbermouth and tells everyone our family secrets.
A2 The blabbermouth in the office can't keep a secret for more than a day.
B1 I don't trust him with sensitive information, he's a notorious blabbermouth.
B2 The blabbermouth couldn't resist gossiping about the company's upcoming merger.
C1 Her reputation as a blabbermouth cost her the promotion she was hoping for.
C2 Despite being warned, the blabbermouth couldn't resist spreading rumors about his colleagues.
formal The blabbermouth in the office cannot keep any secrets.
informal Don't tell Sarah anything important, she's a total blabbermouth.
slang I can't stand that blabbermouth, always gossiping about everyone.
figurative His blabbermouth got him into trouble with the authorities.
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