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This idiom means "Talking a lot without significant results". I was wondering if there was a specific idiom to say this. So far, I have found nothing but "hot air merchant".

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The single word bloviate, according to Merriam-Webster, means “to speak or write verbosely and windily”; Oxford gives “Talk at length, especially in an inflated or empty way”.

Wikipedia suggests that the word is particularly associated with political speeches in Ohio, and U.S. President Warren G. Harding was particularly good at it.

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Hot air is an expression that means

Empty talk that is intended to impress.

  • ‘they dismissed the theory as a load of hot air’

We generally say someone is full of hot air

Talking a lot, especially without saying anything of value or meaning.

  • Did the salesman tell you anything new, or was he just full of hot air?

or that they are blowing hot air

A person that has a lot of verbal wind that likes to sound off

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