backchannel
noun
Definitions
The smaller of two channels in a river that diverge to form an island.
An unofficial communications channel used to make informal or subversive negotiations.
A real-time online discussion that occurs simultaneously with a verbal presentation.
A gesture or short prompt by which a listener invites a speaker to continue.
verb
Definitions
To employ a back channel.
To employ non-verbal (oral and visual) means to influence a speaker without interruption.