get it out of one's system

idiom

informal

1

: to do something that one has been wanting to do so that one no longer feel a strong desire to do it

You keep talking about making a cross-country trip. I think you just need to do it and get it out of your system.

2

: to get rid of a strong emotion (such as anger) by doing something

He really angered her, so she went for a walk to get it out of her system.