Meaning: to try to hear what people are saying when they don't know you're listeningSynonym: eavesdrop
- listen in Kelly said she caught her brother listening in when she was with boyfriend. She opened the door and he was standing right there!
- listen in on sth/sb Do you think government agencies should be allowed to listen in on our private telephone calls?
The police have to get permission from a judge before listening in on
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Contributor: Matt Errey