jack in

verb3

1. •
   (UK) To stop doing a regular activity, such as a job or studying.

   • I've had enough of working nights, so I'm going to jack in my job.
   • I'm going to jack my job in.
2. •
   To insert an electronic coupling into a receptacle; to connect to something, whether involving a physical medium or not.
3. •
   To connect a brain directly to a computer.

   • Watchman replaced him in the linkup seat. He jacked himself into the computer. — 1970