stick (one's) foot in (one's) mouth

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stick (one's) foot in (one's) mouth

To unintentionally say something foolish, tactless, or offensive. He just tends to stick his foot in his mouth when he's forced to speak for too long, so try to get him off stage as soon as possible. Oh man, did I ever stick my foot in my mouth—I just congratulated Sarah's sister on being pregnant. She isn't.
See also: foot, mouth, stick