From Longman Dictionary of Contemporary Englishput your foot in itput your foot in itespecially British English, put your foot in your mouth especially American EnglishMISTAKE to say something without thinking carefully, so that you embarrass or upset someone I’ve really put my foot in it this time. I didn’t realize that was her husband! → foot
Examples from the Corpus
put your foot in it• She's a little weird isn't she? Oh no, have I put my foot in my mouth? Is she a friend of yours?• Somehow, with her usual clumsiness, she had opened her mouth and put her foot in it.• It wasn't her fault if she had a gift for putting her foot in it.• Glover had put his foot in it somehow.• It was immediately clear that he had put his foot in it.• I have put my foot in it.• Simon wanted to finish the conversation before he put his foot in it any further.• As creative types, we're notoriously unpredictable, and thus liable to put our foot in it in front of touchy clients. 