Question

meaning of the idiom to be in full swing ​

Answer 1

In full operation, at the highest level of activity. For example, After the strike it would be some time before production was in full swing

Answer 2

Heya✌

This idiom indicates at a stage where highest level of activity takes place or at the peak stage.

That means when a person is in a huge profit and he's getting all the projects he's said to be  in full swing.

Hope it helps u..

Have a great day :)