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to put (one’s) foot in it (to say or do the wrong thing)
A: I really put my foot in it when I asked Zoe how her husband was. I forgot they had got divorced.
B: Yes, you did. It was really embarrassing.
A: Greg put his foot in it again this year.
B: Why? What did he do?
A: He forgot our wedding anniversary again!
Tell us about a time when you put your foot in it. What happened?