Автор: Chocolate
« : Вчера в 21:49:11 »To beat the air
Meaning: to do something useless
He was beating the air during the whole lesson.
I used to use this expression very often.
Call it a Day
Meaning
To stop what you are doing because you don't want to do it anymore or you think you've done enough
Examples
I am too tired, let's call it a day
It's such good weather, let's stop working and call it a day!
It's much easier to live with such attitude. However, it should be treated with care when it comes to relationships with close people and other essential things.