backchannel

back channel

noun
a secret, unofficial, or informal channel of communication as used in politics or diplomacy: sensitive information passed on through a back channel.

back-channel, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
back channel

noun
an alternative to the regular channels of communication that is used when agreements must be made secretly (especially in diplomacy or government); "they negotiated via a back channel" 
WordNet® 3.0, © 2006 by Princeton University.
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