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Definition of jack in phrasal verb from the Oxford Advanced Learner's Dictionary

jack in

phrasal verb

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jack in/into something

(informal) to connect to a computer system
- I'm jacking into the internet now.
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jack something in

(British English, informal) to decide to stop doing something, especially your job
- After five years, he decided to jack it all in.

See jack in in the Oxford Advanced American Dictionary

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