English

Definition of close in phrasal verb from the Oxford Advanced Learner's Dictionary

 

close in

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1when the days close in, they become gradually shorter during the autumn/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

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close in on somebody

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close in on something

 
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to move nearer to somebody/something, especially in order to attack them The lions closed in on their prey.
See the Oxford Advanced American Dictionary entry: close in