English version

hot air

From Longman Dictionary of Contemporary Englishhot airˌhot ˈair noun [uncountable]  things that someone says that are intended to sound impressive but do not really mean anything or are not true The theory was dismissed as a lot of hot air.
Examples from the Corpus
hot airToday, however, most recommendations are known to be hot air and tail-covering platitudes.Too much hot air and not enough plan.You think this stuff about flying is a lot of hot air.
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