OFFLINE
Etymology
Adjective
offline (not comparable)
Of a system, currently not connected (generally electrically) to a larger network. For example, a power plant which is not connected to the grid, or a computer which is not connected to the Internet or to any other communications service.
Antonym: online
(by extension) Happening in the physical world (the real world) as opposed to on the internet.
Synonym: IRL
Antonym: online
Adverb
offline (not comparable)
While offline; with an offline system.
Antonym: online
(corporate jargon) Outside the current meeting, in a more private setting.
Verb
offline (third-person singular simple present offlines, present participle offlining, simple past and past participle offlined)
(computing, transitive) To take (a system, etc.) offline; to demote from an active or online state.
Source: Wiktionary