Hot air :
Airs and graces
An affected manner of behaving, designed to attract or impress
Give yourself airs
Act pretentiously or snobbishly
1948 Christopher Bush : The Case of the Second Chance : It was said she gave herself airs and it was also hinted that she was no better - as they say - than she might be.
Air in the sense of an affected manner has been current since the mid 17th century
From the early 18th century the plural form has been more usual in this derogatory sense
Emptytalk that is intended to impress
1998 Times - If a chief executive is convinced that a day spent hot-air ballooning is a more effective way of motivating the troops than a lot of hot air from him or her, then anything goes.
Up in the air
(Of a plan or issue) still to be settled
1995 Scientific American - Prospects for federal research and development are up in the air as Republicans looking for budget cuts take control on Capitol Hill.
On the air
Being broadcast on radio or television
Off the air
Not being broadcast on radio or television
Take the air
Go out of doors
Walk on air
1977 Bernard MacLaverty Secrets - I'm sure you're walking on.
Hot air :
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