To accidentally say something embarrassing, offensive, or inappropriate.
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To say something embarrassing by accident.
When you put your foot in your mouth, you realize too late that your comment was the wrong thing to say.
It usually happens in front of other people.
"Speak Out of Turn"
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Saying something at an inappropriate time or without the right to say it
"Let the Cat out of the Bag"
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Accidentally revealing a secret or surprise that was supposed to be kept hidden
"Put Your Foot in Your Mouth"
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Accidentally saying something embarrassing or hurtful without intending to