- 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.