To put your foot in it is to say something that causes embarrassment. Try not to put your foot in it again.
It is always accidental, which is what keeps it comic rather than cruel. Americans usually say put your foot in your mouth for the same mistake.
1phraseput your foot in itTo say something that causes embarrassment.
“Ask him about the wedding and you will put your foot in it.”
put your foot in it is a phrase.
Practised in Idioms