Meaning of “back-channel” in the English Dictionary

"back-channel" in Business English

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back-channeladjective [ before noun ]

uk us

using a different or unofficial method of communication:

There have been reports about informal back-channel peace talks between the two governments.
back channel
noun [ C ]

You can involve the audience in a presentation by incorporating a back channel with which they can suggest questions, and comment on each other's questions.

(Definition of “back-channel” from the Cambridge Business English Dictionary © Cambridge University Press)