"Shot Your Mouth Off": Idiom for Reckless Speech

Shoot one's mouth off = speak impulsively, indiscreetly, or boastfully, often revealing secrets or making threats one cannot back up.

Examples

• "I shot my mouth off about quitting; now I have to job‑hunt."
• "She shot her mouth off about the merger; legal sent a cease‑and‑desist."

Related Idioms

• Run off at the mouth
• Spill the beans
• Put one's foot in one's mouth

Implies regret and social/professional consequences.