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listen in on sth

phrasal verb with listen
 
 
/ˈlɪs.ən/ verb [I]

Definition

C2 If you listen in on a conversation, you listen to it, especially secretly, without saying anything: I wish Dad would stop listening in on my phone conversations.Using the ears
(Definition of listen in on sth from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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