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jack in

(transitive, adverb) (slang) to abandon or leave (an attempt or enterprise)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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jack in in Technology

To log on to a machine or connect to a network or BBS, especially for purposes of entering a virtual reality simulation such as a MUD or IRC (leaving is "jacking out"). This term derives from cyberpunk SF, in which it was used for the act of plugging an electrode set into neural sockets in order to interface the brain directly to a virtual reality. It is primarily used by MUD and IRC fans and younger hackers on BBS systems.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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