He promises everything but he's full of hot air.
full of hot air
idiomTalking a lot, especially without saying anything of value or meaning.
The salesman talked for an hour, but we knew he was full of hot air and wouldn't deliver.
The politician's speech was full of hot air — grand promises with no plan to back them up.
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air one's dirty laundry in public
To reveal one's sordid secrets to the public.
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air one's dirty linen in public
Synonym of air one's dirty laundry in public.
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air out
To expose to air; to leave open or spread out, as to allow odor or moisture to dissipate.
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air rage
Aggressive, disruptive behaviour on an aircraft.
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air sandwich
A strategy that has high-level direction and low-level operations, but little in the middle.
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baking hot
Very hot.
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blow hot air
To engage in empty or exaggerated talk that lacks substance, credibility, or truth; to bluster.
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blow hot and cold
To behave inconsistently; to vacillate or to waver, as between extremes of opinion or emotion.