The Collaborative International Dictionary
off-line \off-line\ adj.
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(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).
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.
Douglas Harper's Etymology Dictionary
Wiktionary
a. (alternative spelling of offline English)
WordNet
Usage examples of "off-line".
Anyway, it seems that one of their innumerable holidays was about to conclude on Amado III when the climate controller monitoring equipment took itself off-line to go hunting for this mythical suprahuman intelligence.
The airport biometric scanners might have been off-line, but Rakkim had decided to puddle-jump their way south anyway.
The Gizmo lay on its side like some gigantic beached squid, all functions off-line, and with them everything on the homestead that ran through it.
The less skilled, if that was not an oxymoron in the call-in psychic hotline business, quickly dropped off-line when he started talking about Interlopers that inhabited natural objects such as trees and rocks.
The PSPT layer was for micrometeoroid protection, a final fail-safe for the station in case the station-keeping deflectors went off-line.
It was possible to link ansibles to scan and get an almost-instantaneous scan of an entire system, but that took the ansibles off-line for other uses.
Locatorcanbe also downloaded and used off-line and its is surprisingly user-friendly.
Wallace, give me a targeting solution, but keep the active sensors off-line.
That made sense: the off-line Seahaven, or at least the beachfront Parcade, was the best source on this coast for grey-market electronics.
A hastily orbited replacement satellite worked fine for a few days, but subsequent to apparent collusion with the rogue relay, promptly went off-line itself.
Our main server is off-line, and all wireless external phone lines are bollixed.
The air circulators were off-line, along with most of the other equipment on the station.
Nodes had gone down all over the planetary net, branch offices off-lined and isolated during the mop-up.
The unit had then simply dropped off-line, blocked in mid-transmission by sophisticated electronic jamming from a ground-based source.
When the station dropped off-line, we figured it must be storm damage to their communications equipment.