full of hot air

air one's dirty laundry in public

To reveal one's sordid secrets to the public.

air one's dirty linen in public

Synonym of air one's dirty laundry in public.

air out

To expose to air; to leave open or spread out, as to allow odor or moisture to dissipate.

air rage

Aggressive, disruptive behaviour on an aircraft.

air sandwich

A strategy that has high-level direction and low-level operations, but little in the middle.

baking hot

Very hot.

blow hot air

To engage in empty or exaggerated talk that lacks substance, credibility, or truth; to bluster.

blow hot and cold

To behave inconsistently; to vacillate or to waver, as between extremes of opinion or emotion.