or off-line, off line
Origin of offline
Examples from the Web for offline
On and offline, offenses ranged from awful Tinder messages to violent threats on Twitter to street stalking.10 Things That Made Us Want to Turn Off the Internet Forever in 2014|The Daily Beast|December 15, 2014|DAILY BEAST
“Off-the-record conversations happen all the time in the offline world,” the company notes.Confide Is the Best Way to Keep Your Dastardly Deeds Hidden—For Now|Daniel Gross|January 17, 2014|DAILY BEAST
But 2014 is the year to get offline and on the road to check out some of these kitty-centric locations.The Cat's Meow: Top 10 Destinations for Feline Fanatics|Lonely Planet|December 20, 2013|DAILY BEAST
Maybe take it offline for a few days and try to test it some more and see if you can make the accuracy better.Send Me to Heaven App, Which Encourages Phone Throwing, Is a Buzzkill|Winston Ross|August 8, 2013|DAILY BEAST
If you have zero access to the internet, that is an offline device.PS 4 Beats Xbox One For Best New Video Game Console|Winston Ross|June 13, 2013|DAILY BEAST
Lil was upset—even through my bemused, offline haze, I could tell that.
My character was a swabbie on the pirate ship Zombie Charger, and he'd wound down while I'd been offline.Little Brother|Cory Doctorow
Your friend here tells me your systems have been offline for more than a month.