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Noun: bigmouth  'big,mawth
Usage: informal
  1. A person who causes trouble by speaking indiscreetly
    "The bigmouth at the bar kept insulting other patrons";
    - loudmouth [informal], blusterer

Derived forms: bigmouths

Type of: bad hat [informal], mischief-maker, trouble maker, troublemaker, troubler

Encyclopedia: Bigmouth