Close-in-on meaning

(idiomatic) To enclose around; to tighten or shrink; to collapse.

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

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(idiomatic) To catch up with in a chase; to near the end of a pursuit.

The police closed in on the suspect.

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(idiomatic) To near a goal or completion.

I think we are closing in on the end of this project.

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