put one's foot in one's mouth

Attested from 1887; from earlier put one's foot in it.

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put one’s foot in one’s mouth

1. (idiomatic) To misspeak, to say something embarrassing or wrong, or to make a mistake in public, or a social blunder, that is embarrassing or offensive. Nowadays usually put your foot in your mouth.

   I really put my foot in my mouth during the interview.

• foot-in-mouth disease

• a closed mouth gathers no feet