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English definition of “listen in on sth/sb”

listen in on sth/sb

verb [I] uk phrasal verb with listen   /ˈlɪs.ən/ us  
C2 If you listen in on a conversation or on someone talking, you listen, especially secretly, without saying anything: I wish Dad would stop listening in on my phone conversations.
(Definition of listen in on sth/sb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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