English

Verb

shoot off at the mouth

1. (informal, idiomatic) To boast, or brag, or talk too much.
   • 2003, Henry Kissinger, Crisis: The Anatomy Of Two Mojor Foreign Policy Crises, p.28

     Don't let [presidential press secretary Ron] Ziegler shoot off at the mouth without our knowledge.

2. (informal, idiomatic) To disclose some information that was supposed to be secret.