Definition of backchannel noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈbæktʃænl//
    ; NAmE NAmE//ˈbæktʃænl//
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  1. 1a secret or unusual way of passing information to other people
  2. 2(linguistics) a sound or sign that somebody makes to show that they are listening to the person who is talking to them
See the Oxford Advanced American Dictionary entry: backchannel