put your foot in it
put (one's) foot in it
To unintentionally say something foolish, tactless, or offensive. Oh man, did I ever put my foot in it—I just congratulated Sarah's sister on being pregnant. She isn't. He just tends to put his foot in it when he's forced to speak for too long, so try to get him off stage as soon as possible.
put your foot in itBRITISH, AMERICAN or
put your foot in your mouthAMERICAN
COMMON If you put your foot in it, you say something which embarrasses or offends the person you are with, and embarrasses you as a result. I put my foot in it straight away, referring to folk music. Tom sat forward and glared. `It's not folk music, man. It's heritage music.' To the majority of voters, he is a lightweight, forever putting his foot in his mouth.
put your foot in it (or put your foot in your mouth)say or do something tactless or embarrassing; commit a blunder or indiscretion. informal
1992 Deirdre Madden Remembering Light & Stone As the evening went on, and people made a point of not talking to me, I realized that I'd put my foot in it.