put one's foot in it
Make a blunder, as in I didn't know it was a surprise party; I guess I put my foot in it. This expression presumably alludes to setting one's foot down in mud or excrement. [Late 1700s] Also see foot in one's mouth.
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How to use put one's foot in it in a sentence
To put it rather uncharitably, the USPHS practiced a major dental experiment on a city full of unconsenting subjects.
Added to drinking water at concentrations of around one part per million, fluoride ions stick to dental plaque.
In his view, a writer has only one duty: to be present in his books.
Yet this, in the end, is a book from which one emerges sad, gloomy, disenchanted, at least if we agree to take it seriously.
The fear of violence should not determine what one does or does not say.
Practise gliding in the form of inflection, or slide, from one extreme of pitch to another.Expressive Voice Culture|Jessie Eldridge Southwick
He alludes to it as one of their evil customs and used by them to produce insensibility.
There was a rumor that Alessandro and his father had both died; but no one knew anything certainly.Ramona|Helen Hunt Jackson
He was voluble in his declarations that they would “put the screws” to Ollie on the charge of perjury.The Bondboy|George W. (George Washington) Ogden
Truth is a torch, but one of enormous size; so that we slink past it in rather a blinking fashion for fear it should burn us.Pearls of Thought|Maturin M. Ballou