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

 

come in

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1when the tide comes in, it moves toward the land opposite go out
  2. 2to finish a race in a particular position My horse came in last.
  3. 3to become fashionable Long hair for men came in in the sixties. opposite go out
  4. 4to become available We're still waiting for copies of the book to come in.
  5. 5to have a part in something I understand the plan perfectly, but I can't see where I come in.
  6. 6 to arrive somewhere; to be received The train is coming in now. News is coming in of a serious plane crash in Pennsylvania. She has over a thousand dollars a month coming in from her investments.
  7. 7to take part in a discussion Would you like to come in at this point, Susan?
  8. 8(of a law or rule) to be introduced; to begin to be used

come in (on something)

 
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to become involved in something If you want to come in on the deal, you need to decide now.
See the Oxford Advanced Learner's Dictionary entry: come in