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What is the meaning of [TO BE FULL OF HOT AIR!]

TO BE FULL OF HOT AIR!

= When someone talks a lot about something
he/she can or will do but in reality, there is no
truth in any of what he/she is saying – just hot
air!

He went on the job interview because the company said they would be able to offer him a good position, but during the interview, he realized it was too small, with no opportunities. The manager was just full of hot air!