be a loud mouth

be a loud mouth

To have a tendency or habit of speaking incessantly, indiscreetly, and/or in a noisy, boastful manner. I can't stand Terry's new husband—he's such a loud mouth when he drinks! If I had known you were such a loud mouth, I'd have never shared my secret with you!
See also: loud, mouth
Farlex Dictionary of Idioms.
See also:
  • loud
  • loudmouth
  • have a loud mouth
  • have a big mouth
  • big mouth, have a
  • loud mouth
  • bigmouth
  • a big mouth
  • big mouth
  • to wake the dead, loud enough