# all mouth and trousers

idiom

Source: https://englishreference.com/idiom/all-mouth-and-trousers
Updated: 2026-08-10

## Meaning

Superficial, engaging in empty, boastful talk, but not of real substance.

## Examples

- He talks big about his plans, but he is all mouth and trousers.
- Don't expect him to help with the project; he is all mouth and trousers when it comes to hard work.
- Despite his grandiose promises of reform, the politician proved to be all mouth and trousers, failing to deliver any meaningful change.

## Origin

From *mouth*, denoting speech in place of action, and *trousers*, a reference to contemporary masculine dress or the genitals. The idiom suggests a discrepancy between verbal bravado and physical or anatomical substance.

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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.