Wiktionary
vb. 1 (context transitive idiomatic British English) To stop doing a regular activity. Often a job or studies. 2 (context music recording computing electronics English) To insert an electronic coupling into a receptacle; to connect to something, whether involving a physical medium or not. 3 (context science fiction English) To connect a brain directly to a computer.
Usage examples of "jack in".
Looking back upon jack in this light, I do feel that I might have gained a certain facility there for the brief, impressionistic description of the exotic which could have carried over into both Nine Princes and Jack.
The photo of Gail Jack in her youth was a stroke of genius, and Rebus didn't doubt that the genius behind it was Ian Urquhart.
An unkind image came to Rebus then, of Jack in leather gear and Helen Greig on a leash .
There was enough of Big Jack in her veins that running a con wouldn't be a stretch of her skills.
He had the portable transfer tube prepared, and was ready to jack in.
Newspace veteran Jack in his scarlet Alpha, out into the fog that was not.
An Invid scientist had dragged Jack in-down, actually, to some underground level of the hive.