get after

English

To move into action in pursuit of something.
He's wasting time at university not getting after his degree.

If you want to win, you've got to get after it.
To move into action in attempt to catch or defeat another.
The defensive line needs to get after the quarterback.

Do you think the girl's going to ask you out? Get after her!
To attempt to convince another to move into action.
Parents get after their children to do homework for the best.