put foot in mouth

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Related to put foot in it: set foot, fleet of foot

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

To unintentionally say something foolish, tactless, or offensive. He just tends to put 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 put my foot in my mouth—I just congratulated Sarah's sister on being pregnant. She isn't.
See also: foot, mouth, put

put one's foot in one's mouth

 and put one's foot in it; stick one's foot in one's mouth
Fig. to say something that you regret; to say something stupid, insulting, or hurtful. When I told Ann that her hair was more beautiful than I had ever seen it, I really put my foot in my mouth. It was a wig. I put my foot in it by telling John's secret; he found out.
See also: foot, mouth, put

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

To make a tactless remark.
See also: foot, mouth, put