Home > Phrasal Verb Dictionary: Letter J
A B C D E F G H I J K L M N O P R S T W Z
Jack in [Jack something in].- (job, course, studies) When you jack
something in, you stop doing something you don't like. 
Pack in
- He decided to jack in his job and spend more time with his family.
- I can't stand it anymore; I'm going to jack it in.
Jack up [Jack something up].- (car) When you jack something up, you lift it off the ground using a jack.
- He jacked up the car and changed the wheel in no time.
Jam on [Jam on something].-
(insep) When you jam the breaks on,
you use them suddenly with a lot of force. Slam on
- He jammed on the brakes but it was too late to avoid hitting the other car.
Jazz up [Jazz something up].- (party, salad) When you jazz something up,
you make it more interesting or exciting. Liven up
- One good way to jazz up your salads is by adding toasted nuts.
- Pictures can really jazz up the computer's desktop.
Join in.- (insep) (work, applause, celebrations, fun, game, discussion) When you join in, you take part or become involved.
- They couldn't wait to join in the fun.
Join up.- (insep) When you join up, you become a member of the Armed forces.
- He packed in his job and joined up.
Jot down [Jot something down].- (address, number, message) When you jot something down, you make a quick and short note of something.
- Jot it down before you forget it.
Jumble up.-
(insep) (papers, thoughts, ideas, emotions) When things are jumbled up, they are all mixed together. Mix up
- Everything gets so jumbled up in my life that I never know which direction I'm supposed to be going, or why, or when I'll reach what I'm looking for.
Jump at [Jump at something].- (insep) (chance, offer, opportunity) When you jump at something, you take it quickly. Leap at
- He told the budding actors to jump at every opportunity they can to perform Shakespeare.
Jump off [Jump off something].- (insep) (bus, train, plane, boat, horse, roof, cliff, bridge) When
you jump off a vehicle or a place, you leave it suddenly by jumping. 
Get off 
Jump on
- I jumped off the boat onto the dock thinking this would help and lost my balance, scraping my knees and elbows. It was a terrible experience.
For other verbs and to get more examples