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

 

listen in

 phrasal verb
phrasal verb Radio broadcasting
 
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Phrasal Verbs

    listen in

    |

    listen in on something

    |

    listen in 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 related entries: Radio broadcasting
See the Oxford Advanced American Dictionary entry: listen in