off-line - meaning and definition. What is off-line
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Online Dictionary

What (who) is off-line - definition

TERMS FOR BEING CONNECTED TO, OR DISCONNECTED FROM, THE INTERNET
On-line; Offline; Online; Off-line; Off-power; Come online; On-line and off-line; Online & offline; On-/off-line; On/offline; OnLine

off-line         
<jargon> (Or "offline") 1. Not directly connected to the computer (e.g., an off-line tape drive), or with connection suspended ("take the printer off-line"). Contrast background, on-line. 2. Not now or not here. "Let's take this discussion off-line." Specifically used on Usenet to suggest that a discussion be moved off a public newsgroup to e-mail. See also off-line world. [Jargon File] (1996-02-02)
Off line regulator         
Off-line regulator; Offline regulator
An off line regulator, off-line regulator, or offline regulator is an electronic voltage regulation or current regulation device that is designed to directly accept electric power obtained from an alternating current utility power source. That is "off the mains voltage line".
offline         
If a computer is offline, it is not connected to the Internet. Compare online
. (COMPUTING)
ADJ
Offline is also an adverb.
Most software programs allow you to compose emails offline.
off line: see line
ADV: ADV with v

Wikipedia

Online and offline

In computer technology and telecommunications, online indicates a state of connectivity and offline indicates a disconnected state. In modern terminology, this usually refers to an Internet connection, but (especially when expressed "on line" or "on the line") could refer to any piece of equipment or functional unit that is connected to a larger system. Being online means that the equipment or subsystem is connected, or that it is ready for use.

"Online" has come to describe activities performed on and data available on the Internet, for example: "online identity", "online predator", "online gambling", "online game", "online shopping", "online banking", and "online learning". Similar meaning is also given by the prefixes "cyber" and "e", as in the words "cyberspace", "cybercrime", "email", and "ecommerce". In contrast, "offline" can refer to either computing activities performed while disconnected from the Internet, or alternatives to Internet activities (such as shopping in brick-and-mortar stores). The term "offline" is sometimes used interchangeably with the acronym "IRL", meaning "in real life".

Pronunciation examples for off-line
1. So this is deliberately set off line
Worldwide African Math & Science Contributions _ Manu Ampim _ Talks at Google
2. They communicate. We have off-line meetings.
ted-talks_37_JimmyWales_2005G-320k
3. If I know somebody is squatting off line,
Connecting You to Your Movement Path _ Gray Cook _ Talks at Google
4. that billions of our processors have been off line.
ted-talks_525_AlexTabarrok_2009-320k
5. based on an on- and off-line signature petition,
ted-talks_2418_MelatiWijsen_2015G-320k
Examples of use of off-line
1. "Everything has been taken off–line," said the woman, who would not give her name.
2. The reactor has been taken off–line,‘‘ the Emergency Situations Ministry said in a statement.
3. That accidentally triggered other banks of transformers to go off–line.
4. The main government site went off line in the early hours of Sunday.
5. The main government Web site went off line in the early hours of Sunday.