close in on

verb3

1. •
   To catch up with in a chase; to near the end of a pursuit.

   • The police closed in on the suspect.
2. •
   To near a goal or completion.

   • I think we are closing in on the end of this project.
3. •
   To enclose around; to tighten or shrink; to collapse.

   • Sometimes it feels like the walls are closing in on me.