Verb listen in has 2 senses
  1. listen in - listen quietly, without contributing to the conversation
    --1 is one way to
    listen
    Sample sentence:
    Somebody ----s
  2. listen in, eavesdrop - listen without the speaker's knowledge; "the jealous man was eavesdropping on his wife's conversations"
    --2 is one way to listen
    Sample sentences:
    Somebody ----s
    Somebody ----s PP
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