Dictionary

listen in

verb

Definition of LISTEN IN

intransitive verb
1
:  to tune in to or monitor a broadcast
2
:  to listen to a conversation without participating in it; especially :  eavesdrop
lis·ten·er–in \ˌlis-nər-ˈin, ˌli-sən-ər-\ noun
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First Known Use of LISTEN IN

1905

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