Longman Dictionary of Contemporary English homepage

jack

2 verb
     
jack2

jack somebody around

phrasal verb
American English spoken to waste someone's time by deliberately making things difficult for them:
Stop jacking me around and make up your mind!

jack something ↔ in

phrasal verb
British English informal to stop doing something:
I'd love to jack in my job and go and live in the Bahamas.

jack off

phrasal verb
American English informal not polite to masturbate

jack something ↔ up

phrasal verb
1 to lift something heavy off the ground using a jack:
Jack the car up higher - I can't get the tire off.
2 informal to increase prices, sales etc by a large amount:
They're just interested in jacking up their profit margins.

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