listen in (on something) Meaning in the Cambridge English Dictionary
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Meaning of “listen in (on something)” in the English Dictionary

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listen in (on something)

phrasal verb with listen  us   /ˈlɪs·ən/ verb [I]
to listen to someone’s ​conversation when the ​person does not ​realize you are doing it: She ​thinks her ​boss is listening in on her ​phoneconversations.
(Definition of listen in (on something) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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