the air

Don't worry about her, she always gives herself airs and graces  

: means  

She always thinks she's very important 

I honestly think the time has come to clear the air  

 :means

 to make things simpler
  

 There's a lot of discussion in the air about it  

: mean  

 that's not definite 

  
I don't know about you but I feel like taking the air at the moment 

: means

 going for a walk 

 

When I told him the news, he went up in the air  

    :means       

 he became angry
 

You know what they're like. They just talked a lot of hot air                            

                 : means    

 empty promises
  

The radio play is on the air later tonight  

: means 

 being broadcast
    

As soon as they heard the news, they were walking on air

means    

 were very happy

The concert is being played in the open air on Sunday  means  

 outside