English version

backchannel

From Longman Business Dictionarybackchannelback‧chan‧nel /ˈbækˌtʃænl/ (also back-channel) noun [countable] someone or something that passes information secretly or unofficially from one person to anotherYou’ll find out more in this organization through the backchannels than from any number of staff briefings.back-channel diplomacy
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