all talk and no trousers

The phrase "all talk and no trousers" is an idiom used to describe someone who talks confidently or boastfully about something, but fails to take any action or follow through with their words. It implies that the person lacks substance or the ability to back up their claims with actual deeds, often suggesting their words are empty or insincere. "Trousers" in this context refers to action or results, implying that the person is not genuinely committed to their words or lacks the ability to deliver on their promises.