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back emf
back emission
back end
back end load
back-formation
back forty
back four
back issue
back kitchen
back line
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back month
back mutation
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back o’ Bourke
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back channel
back chan·nel (plural back chan·nels)


noun 
Definition:
 
indirect means of exchanging sensitive information: a covert way of exchanging sensitive information in politics or diplomacy that circumvents the usual procedures
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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