“To dance on air” is to be very happy. Jane has been dancing on air since she fell in love with Bob. “To dance to a different tune” is to change behavior after an event in someone’s life. Joe is dancing to a different tune since he won the lottery. “Out of step” means to not be aware of something. David is out of step with the latest fashion. (A video for people learning English. Subscribe to our channel if you would like to watch more videos like this.) Distributed by Tubemogul. Less