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Phrase Meanings » listen in
What does "listen in" mean?
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Hear or overhear the conversation of others; eavesdrop. It is also put as listen in on, as in She listened in on her parents and learned they were planning a surprise party. [Early 1900s]
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Tune in and listen to a broadcast, as in Were you listening in the other night when they played Beethoven's Fifth? [1920s]