listen in - definition and synonyms

phrasal verb [intransitive]
present tense
I/you/we/theylisten in
he/she/itlistens in
present participlelistening in
past tenselistened in
past participlelistened in
  1. 1
    to secretly listen to what someone says
    listen in on:

    Rachel was listening in on our conversation.

     Synonyms and related words
See also main entry: listen