jack - definition and synonyms

verb 

Your browser doesn’t support HTML5 audio

/dʒæk/
present tense
I/you/we/theyjack
he/she/itjacks
present participlejacking
past tensejacked
past participlejacked

phrasal verbs

jack around

present tense
I/you/we/theyjack around
he/she/itjacks around
present participlejacking around
past tensejacked around
past participlejacked around
American informal
  1. 2
    [transitive] jack someone around to treat someone badly because you are not clear or honest with them

jack in

present tense
I/you/we/theyjack in
he/she/itjacks in
present participlejacking in
past tensejacked in
past participlejacked in
informal
  1. 1
    [transitive] British to stop doing something, especially a job or a course of study

    Did you know that Jenna’s jacked in her college course?

  2. 2
    [intransitive/transitive] to connect two pieces of electronic or computer equipment so that you can start using them

jack off

[intransitive/transitive]
present tense
I/you/we/theyjack off
he/she/itjacks off
present participlejacking off
past tensejacked off
past participlejacked off
American impolite

jack up

present tense
I/you/we/theyjack up
he/she/itjacks up
present participlejacking up
past tensejacked up
past participlejacked up
  1. 1
    [transitive] to use a jack to lift and support a heavy object, especially a car
  2. 2
    [transitive] informal to increase the price, rate, or number of something by a large amount
  3. 3
    [intransitive/transitive] informal to put an illegal drug into your body using a needle
    1. a.
      be jacked up mainly American informal to be very excited or nervous, especially because you have taken an illegal drug
  4. 4
    [intransitive] Australian informal to refuse to obey instructions