Definition of backchannel noun from the Oxford Advanced American Dictionary

     

    backchannel

     noun
    noun
    NAmE//ˈbækˌtʃænl//
     
     
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  1. 1a secret or unusual way of passing information to other people
  2. 2(linguistics) a sound or sign that someone makes to show that they are listening to the person who is talking to them
See the Oxford Advanced Learner's Dictionary entry: backchannel