a big mouth

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a big mouth

1. A tendency or habit of speaking incessantly and indiscreetly, especially about sensitive or secret information. If I'd known you had such a big mouth, I'd have never shared my secret with you! God you've got a big mouth! Don't you ever stop talking about other people's business?
2. A person who talks in such a manner. I can't stand Terry's new husband, he is such a big mouth!
See also: big, mouth

a big mouth

  (informal)
if you have a big mouth, you talk too much, especially about things that should be secret Helen's got such a big mouth - the news'll be all over the town by tonight. I knew I shouldn't have mentioned the letter. Oh dear, me and my big mouth!
See also: big, mouth