shoot off (one's) mouth

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shoot off (one's) 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 shooting off his 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 shoot off your mouth like that!
2. To be annoyingly or overbearingly talkative, especially in a bragging or boastful manner. There's some guy at the other end of the bar shooting off his mouth about how far he can throw a football.
See also: mouth, off, shoot
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

shoot off one's mouth

Speak indiscreetly; also, brag or boast. For example, Now don't go shooting off your mouth about it; it's supposed to be a surprise, or Terry is always shooting off his mouth about how many languages he speaks. [Slang; mid-1800s]
See also: mouth, off, shoot
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

shoot off (one's) mouth

/face Slang
1. To speak indiscreetly.
2. To brag; boast.
See also: mouth, off, shoot
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
For a moment, I thought I have probably made too many folks unhappy, shooting off my mouth.
Talk may be cheap and deceptive, but I still enjoy shooting off my mouth. It's as addictive as my continuing quest to nab the big silver Frisbee in the night sky.
Two examples of shooting off my mouth, one where I resisted the temptation and another where I did not, come to mind.