listen in (on something) Meaning in Cambridge American English Dictionary
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Meaning of "listen in (on something)" - American English Dictionary

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 phone conversations.
(Definition of listen in (on something) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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