Longman Dictionary of Contemporary English homepage

Topic: MUSIC

Date: 1700-1800
Origin: Perhaps copying the action

jam

2 verb
     
jam2 past tense and past participle jammed, present participle jamming
1

push hard

[transitive 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

[intransitive and transitive] 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

[intransitive and transitive] 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.
jammed (2)
4

music

[intransitive] also jam outAPM to play music in an informal way with other people jam session
5

jam on the brakes

to slow down a car suddenly by putting your foot down hard on the brake
6

jam somebody's/the switchboard

TCT 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

[transitive]TCB to deliberately prevent broadcasts or other electronic signals from being received, by broadcasting signals on the same wavelength
8

somebody is jamming

American English spoken used to say that someone is doing something very quickly or well

jam out

phrasal verb
to dance to music
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