Meaning ofbackchannelin English

Noun

1. an unofficial channel for informal talks; secret negotiations
   The diplomats used a backchannel to negotiate with the opposing side.
2. a simultaneous online discussion during a presentation
   The audience participated in a backchannel on Twitter during the conference.
3. a cue to continue speaking; a listener's prompt
   The listener provided a backchannel to show she was still engaged.