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hot air (n.)

"unsubstantiated statements, boastful talk," 1900, from hot (adj.) + air (n.1). The adjectival phrase hot-air (of balloons, etc.) is from 1813.

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Definitions of hot air from WordNet

hot air (n.)
air that has been heated and tends to rise;
hot air (n.)
loud and confused and empty talk;
Synonyms: palaver / empty words / empty talk / rhetoric
From wordnet.princeton.edu