offline

Webster's Dictionary (GCIDE)

1.(Computers) Not connected; -- of computers or computer peripherals normally connected or intended to be connected to other computers by a communications line; as, we can't print the document because the printer is off-line. [Narrower terms: disconnected, not ready, off; unconnected ] {on-line

Syn: offline, off line(predicate). [WordNet 1.5]

2.Hence: (fig.) Outside of or after a meeting or formal discussion; as, we can discuss the details off-line; -- a term used at meetings and conferences to suggest postponing detailed discussion of a topic so as not to occupy the time of a large group most of whom may not be interested. [PJC]

The Jargon File

Not now or not here. “Let's take this discussion offline.” Specifically used on Usenet to suggest that a discussion be moved off a public newsgroup to email.