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

 

listen in

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    listen in (on/to something)

     
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  1. 1to listen to a conversation that you are not supposed to hear You shouldn't listen in on other people's conversations. They did not know that the police were secretly listening in.
  2. 2to listen to a radio broadcast
See the Oxford Advanced Learner's Dictionary entry: listen in