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close in on

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