Definition of "close in on"

close in on

verb
third-person singular simple present closes in on, present participle closing in on, simple past and past participle closed in on
1. (idiomatic) To enclose around; to tighten or shrink; to collapse.
2. (idiomatic) To catch up with in a chase; to near the end of a pursuit.
3. (idiomatic) To near a goal or completion.