blabbermouth

noun blab·ber·mouth \ˈbla-bər-ˌmau̇th\

: someone who reveals secrets or talks too much

Full Definition of BLABBERMOUTH

: a person who talks too much; especially : tattletale

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1936

Synonyms: babbler, blabber, chatterbox, blowhard, cackler, chatterer, conversationalist, gabbler, gasbag, jabberer, jay, magpie, motormouth, prattler, talker, windbag

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