all mouth and no trousers
Meaning
Someone who talks big or makes bold claims but lacks ability, courage, or follow-through.
Origin
British slang from the late 20th century. “Mouth” = loud talk; “no trousers” implies having nothing to show for it (and a slightly crude, mocking image), i.e., boasting without substance.
Notes
Mainly UK colloquial and mildly crude/derogatory. Used to mock someone (or a project) for boasting without substance. Avoid in formal contexts.
Examples
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He keeps bragging about how tough he is, but when it comes to doing the work he’s all mouth and no trousers.
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Don’t be fooled by their big promises—half the team is all mouth and no trousers.
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I thought she’d negotiate hard, but in the meeting she was all mouth and no trousers.
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The candidate talks a great game online, yet in debates he’s all mouth and no trousers.
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If you’re all mouth and no trousers, people will stop taking you seriously.
Grammar & Usage Notes
Usually used as a predicate/adjective phrase: “He’s all mouth and no trousers.” Occasionally as a noun phrase: “an all-mouth-and-no-trousers type.” Fairly fixed wording.
Synonyms
- all talk and no action
- all bark and no bite
- big talker
- full of hot air
Antonyms
- a person of action
- walk the talk
- put your money where your mouth is