have a big mouth

Meaning

1. 1

   to be bad at keeping secrets

2. 2

   to talk too much, especially about your own abilities and achievements

In the movies · 1

• I have a big mouth, Senator...Too Big to Fail2011
• Anybody from Baker Company have, like, a big mouth?Saving Private Ryan1998
• Hey, Ray Dollarhyde has been bullying you for years because you're small, and fragile, and you have a big mouth.The Adam Project2022

From the same entry

• be too big for your boots
• a big cheese
• big deal
• the big enchilada
• a big fish
• a big girl's blouse
• a big noise
• the big picture
• the big stick
• the Big Three, Four
• give a big hand
• me and my big mouth