From Longman Dictionary of Contemporary Englishjack something ↔ in phrasal verbBritish English informalSTOP DOING something to stop doing something I’d love to jack in my job and go and live in the Bahamas. → jack→ See Verb table
Examples from the Corpus
jack in• We've come to tell you to jack it in.• We were always putting pressure on him to jack it in.• As the child grew, jack noticed in him some quality he valued and which surprised him.• So I couldn't jack it in when things were going well. 