jam1 [dʒæm] n
butter, ↑jam
4¦(difficult situation)¦
6 kick out the jams
7 jam tomorrow
1.) ¦(FOOD)¦ [U and C]
a thick sweet substance made from boiled fruit and sugar, eaten especially on bread
strawberry jam
a jam sandwich
jam jars
a situation in which it is difficult or impossible to move because there are so many cars or people
Sorry we're late. We got stuck in a traffic jam.
3.) ¦(MACHINE)¦
a situation in which a machine does not work because something is stopping a part from moving
It caused a jam in the printer.
4.) ¦(DIFFICULT SITUATION)¦ [C usually singular] informal
a difficult situation
(be/get) in/out of/into a jam
We became friends after he helped me out of a jam.
5.) ¦(MUSIC)¦
a) a ↑jam session
b) a song or piece of music, especially one by a ↑rap or ↑rock group
6.) kick out the jams
AmE informal to play ↑rock music loudly and with a lot of energy or emotion
Make no mistake - these guys know how to kick out the jams.
7.) jam tomorrow
BrE informal good things someone promises you, which never happen
There is an element of 'jam tomorrow' about some of the government's policies.
jam 2
jam2 v past tense and past participle jammed present participle jamming
1¦(push hard)¦
5 jam on the brakes
6 jam somebody's/the switchboard
8 somebody is jamming
Phrasal verbs
 jam out
[Date: 1700-1800; Origin: Perhaps copying the action]
1.) ¦(PUSH HARD)¦ [T always + adverb/preposition]
to push something somewhere using a lot of force, until it can move no further
He jammed his foot on the accelerator and the car sped off.
A chair had been jammed up against the door.
2.) ¦(MACHINE)¦ [I and T]
also jam up
if a moving part of something jams, or if you jam it, it no longer works properly because something is preventing it from moving
The front roller has jammed on the photocopier.
3.) ¦(BLOCK)¦ [I and T]
also jam up
if a lot of people or vehicles jam a place, they fill it so that it is difficult to move
= ↑cram
Crowds jammed the entrance to the stadium.
jam into
They all jammed into the car.
4.) ¦(MUSIC)¦
[i]also jam out
to play music in an informal way with other people
5.) jam on the brakes
to slow down a car suddenly by putting your foot down hard on the ↑brake
6.) jam sb's/the switchboard
if telephone calls jam the switchboard of an organization, so many people are phoning the organization that it cannot deal with them all
Viewers jammed the switchboard with complaints.
7.) ¦(RADIO)¦ [T]
to deliberately prevent broadcasts or other electronic signals from being received, by broadcasting signals on the same ↑wavelength
8.) sb is jamming
AmE spoken used to say that someone is doing something very quickly or well
jam out phr v
to dance to music

Dictionary of contemporary English. 2013.

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, , / (boiled in mass), / (from a crowd), / , , , , (crowded together)

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