# big mouth

idiom

Source: https://englishreference.com/idiom/big-mouth
Updated: 2026-08-10

## Meaning

The mouth of someone who talks too much, especially by making exaggerated claims or by inappropriately revealing information.

## Examples

- Don't tell him your secrets because he has a big mouth.
- I should have known better than to tell Sarah, as she has a big mouth and told everyone at the office.
- His reputation as a big mouth preceded him, ensuring that no one in the inner circle would ever trust him with confidential information again.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.