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general::
Phrase(s): 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.
McGrawhill's American Idioms And Phrasal Verbs