close in on
- (idiomatic) To enclose around; to tighten or shrink; to collapse.
- Sometimes it feels like the walls are closing in on me.
- (idiomatic) To catch up with in a chase; to near the end of a pursuit.
- The police closed in on the suspect.
- (idiomatic) To near a goal or completion.
- I think we are closing in on the end of this project.