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To put your foot in it

 
Examples:

David:
"I saw Susan today and told her that we'd see her at
Sarah's party on Friday."

Mary:
"Oh no. You've really gone and put your foot in it now.
Sarah doesn't want Susan to come to the party.
That's why she didn't invite her."

 
Use:

You put your foot in it when you say something that you shouldn't
and so put yourself or someone else in an embarrassing situation.

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