Don't listen to him, he is just blowing hot air.
blow hot air
idiomTo engage in empty or exaggerated talk that lacks substance, credibility, or truth; to bluster.
The politician promised to lower taxes, but everyone knew he was just blowing hot air to win votes.
Despite his grandiose claims of revolutionizing the industry, his presentation was ultimately revealed to be nothing more than empty rhetoric and blowing hot air.
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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 a fuse
To lose one's temper; to become enraged.
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blow a hole through
To destroy the integrity or cohesion of.