all mouth and trousers
mouth, meaning "talk" rather than action and trousers, presumably at the time of origin a reference to masculinity, either as trousers as a male item of clothing, or a reference to the genitals.
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all mouth and trousers (not comparable)
- Michael Quinion (2004), “All mouth and trousers”, in Ballyhoo, Buckaroo, and Spuds: Ingenious Tales of Words and Their Origins, Washington, D.C.: Smithsonian Books in association with Penguin Books, →ISBN.