- a person who can do many thingsWe gave him a job because we needed a jack-of-all-trades around the factory to look after the many repairs.
- raise pricesThe gas station jacked up their prices during the snow storm.
jam on the brakes
- quickly put the brakes on in a car to stopHe jammed on the brakes and was able to avoid hitting the child.
- crowded, fullThe train that we took this morning was jam-packed with people.
- brighten up, add more noise or movement or colorThey really jazzed up the community center for the party tonight.
- name used for an unknown personWhy do the application forms use "John Doe" as the name of the person who is applying for something?
John Henry (John Hancock)
- signaturePlease sign your John Henry here and we will process your order right away.
- new-comerHe's a Johnny-come-lately and doesn't really know what he is talking about.
- be at the right place when needed, right on timeHe's always Johnny-on-the-spot. Just when we need him he arrives.
jump all over someone
- criticize, scold, blameAs soon as I began to talk about my plans for the summer he jumped all over me.
- take or accept quickly and gladlyHe jumped at the chance to go to Europe on company business.
- run away and fail to come to trial and give up the money you have already paid to the courtHe jumped bail and decided to go and live in a foreign country.
jump down someone's throat
- criticize or become angry with someoneAs soon as I reached the office he jumped down my throat over the missing file.
- the starting place of a long tripWe gathered early in the morning at the jumping-off place for our trip to the mountains.
jump on someone
- scold, criticize, blameEveryone jumped on him at the meeting because they were angry about the new schedules.
jump on the bandwagon (also get or climb on the bandwagon)
- join a popular activityEveryone has jumped on the bandwagon to try and stop smoking in the workplace.
jump out of one's skin
- be badly frightenedI nearly jumped out of my skin when I saw him at the window.
jump the gun
- start before you shouldHe jumped the gun and started selling the tickets before he should.
jump through a hoop
- do whatever one is told to do, obey any orderHe is always ready to jump through a hoop for his boss so he is not very popular with the other employees.
jump to conclusions
- make a quick conclusion without thinkingPlease don't jump to conclusions over who broke the computer.
- nearly, almostI waited just about one hour before the concert started.
- this very moment, a minute agoThe accident happened just now. The police haven't even arrived yet.
- with great care, very carefullyShe always makes sure that her hair is just so before she goes out.
just the same
- neverthelessI told her not to come early but just the same she came early anyway.
just what the doctor ordered
- exactly what is needed or wantedHaving the extra day off from work was just what the doctor ordered and he was able to get his many errands finished.