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Noun: blabbermouth  'bla-bu(r),mawth
  1. Someone who gossips indiscreetly
    - tattletale [US], tattler, taleteller, talebearer, telltale, blabber

Derived forms: blabbermouths

Type of: gossip, gossiper, gossipmonger, newsmonger, rumormonger [US], rumourmonger [Brit, Cdn]

Encyclopedia: Blabbermouth