American English

Definition of close in phrasal verb from the Oxford Advanced American Dictionary

 

close in

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1 when the days close in, they become gradually shorter during the fall
  2. 2if the weather closes in, it gets worse
  3. 3when the night closes in, it gets darker They huddled around the fire as the night closed in.

close in (on somebody/something)

 
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to move nearer to someone or something, especially in order to attack them The lions closed in on their prey.
See the Oxford Advanced Learner's Dictionary entry: close in