run at the mouth

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run at the mouth

1. To speak without discretion; to speak too loudly or freely, especially about sensitive topics or information. We would have gotten away with our plan if your dumb cousin hadn't started running at the mouth all over town. I figured it went without saying that I didn't want to talk about my divorce at Daniel's wedding, but you just had to go and run at the mouth like that!
2. To be annoyingly or overbearingly talkative. There's some guy at the other end of the bar running at the mouth about how far he can throw a football. I feel like I need earplugs because my three-year-old just runs at the mouth all day long.
See also: mouth, run
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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