Idiom B2

Put your foot in your mouth

To say something embarrassing or offensive by accident

Meaning

Put your foot in your mouth — To accidentally say something embarrassing, tactless, or hurtful that creates an awkward or difficult social situation. Literally: the absurd image of placing a foot inside your own mouth. Figuratively: to let words escape that should have stayed unsaid, usually realising the mistake only after the damage is done.

Meaning in Detail

When you put your foot in your mouth, you make a social blunder through speech — usually by saying something that inadvertently offends someone, reveals an embarrassing truth, or demonstrates a misunderstanding of the situation. The key feature is that the mistake is unintentional. You did not mean to cause offence; it simply came out wrong, at the wrong time, to the wrong person.

The idiom describes a very human experience that almost everyone recognises: the sinking feeling immediately after speaking, when you realise your words have landed badly. It can describe comments about someone's appearance, assumptions about a person's situation, or simply saying the wrong thing at the wrong moment. The phrase is used both self-referentially (I really put my foot in my mouth) and to describe others (He put his foot in his mouth with that remark).

Origin & History

The expression is closely related to the older British idiom "put one's foot in it", which dates back to at least the 18th century and refers to stepping into something unpleasant — much like accidentally stepping in mud or worse. The American variant "put your foot in your mouth" makes the metaphor more vivid and physical, imagining the comic impossibility of literally inserting your foot into your mouth as a way of silencing yourself — too late.

The American form gained wide currency during the 20th century, partly through popular journalism and political commentary. US politicians are frequently described as having "put their foot in their mouth" after an ill-judged remark, and the phrase became a staple of American political humour. Today the idiom is used across all English-speaking countries, though British speakers often prefer the variant "put one's foot in it" in informal speech.

Example Sentences

SentenceContext
I really put my foot in my mouth when I asked her when the baby was due — she wasn't pregnant.Social / personal embarrassment
The politician put his foot in his mouth during the interview by accidentally mentioning a classified project.Politics / public speaking
She put her foot in her mouth at the dinner party when she asked the hosts how long they had been married — they had recently separated.Social event / unintentional offence
He knew he had put his foot in his mouth the moment the words left his lips.Self-awareness after a blunder

How to Use It

This idiom is informal and works best in spoken English and casual writing. It is typically used in the past tense (I put my foot in my mouth) to describe a blunder that has just occurred or that happened in the past. It can also be used as a noun phrase: That was a real foot-in-mouth moment. The possessive pronoun must agree with the subject: I put my foot in my mouth / she put her foot in her mouth / he put his foot in his mouth.

Common Mistakes

Mistakes to Avoid

I put my foot in the mouth during the meeting.

I put my foot in my mouth during the meeting. — The possessive pronoun "my" must be used before "mouth", not the article "the".

She put her foot in the mouth on purpose to embarrass him.

She deliberately said something hurtful to embarrass him. — The idiom implies accidental blunder; using it for intentional rudeness is incorrect.

He put his feet in his mouth when he forgot her name.

He put his foot in his mouth when he forgot her name. — "Foot" is singular in this fixed phrase, not "feet".

Similar Idioms

Let the cat out of the bag Speak of the devil Beat around the bush Face the music All Idioms →

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Frequently Asked Questions

What does "put your foot in your mouth" mean?
"Put your foot in your mouth" means to accidentally say something embarrassing, offensive, or tactless — creating an awkward social situation, usually without realising the impact until after you have spoken.
Where does the idiom "put your foot in your mouth" come from?
The phrase is related to the older British expression "put one's foot in it" (to make a clumsy mistake). The American version "put your foot in your mouth" gained wide popularity in the 20th century, vividly capturing the absurd image of silencing yourself with your own foot — but too late to stop the blunder.
Can you give an example of "put your foot in your mouth" in a sentence?
"I really put my foot in my mouth when I asked her when the baby was due — she wasn't pregnant." This illustrates how a well-intentioned comment can accidentally cause offence or embarrassment.
Is "put your foot in your mouth" formal or informal?
This idiom is informal and best suited to spoken conversation, personal stories, casual writing, and informal emails. It is too colloquial for formal, academic, or official writing contexts.
What CEFR level is "put your foot in your mouth"?
This idiom is suitable for B2 (Upper-Intermediate) learners. It is commonly used in everyday English conversation and is especially useful for learners who want to discuss social situations and blunders in a natural, idiomatic way.
What are common mistakes with "put your foot in your mouth"?
A frequent error is using "the mouth" instead of "your mouth" — always use the possessive pronoun matching the subject. Another mistake is using "feet" instead of "foot" — the phrase always uses the singular "foot". Also, the idiom implies an accidental blunder, not deliberate rudeness.
What idioms are similar to "put your foot in your mouth"?
Similar idioms include "let the cat out of the bag" (accidentally reveal a secret), "speak out of turn" (say something inappropriate), and the British "put one's foot in it" (make a clumsy social mistake). All describe accidental speech blunders.
Can "put your foot in your mouth" be used in writing?
Yes, in informal writing such as personal blogs, social media, and casual emails it works naturally. It can also appear in journalism and feature articles for humorous effect. Avoid it in formal academic or official writing where plain language is expected.
How do I practise idioms like "put your foot in your mouth"?
LexFizz's Flash Cards and Flip Tiles exercises are great for practising this idiom. Try writing a short anecdote about a time someone said the wrong thing, using the idiom in context to describe the social blunder.
Does "put your foot in your mouth" have the same meaning in British and American English?
The concept is the same, but the wording differs slightly. British English more commonly uses "put one's foot in it" for the same meaning. The form "put your foot in your mouth" is primarily American, though it is understood throughout the English-speaking world.