Definition of “jam” - English Dictionary

“jam” in British English

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jamnoun

uk /dʒæm/ us /dʒæm/

jam noun (FOOD)

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jamverb

uk /dʒæm/ us /dʒæm/ -mm-

jam verb (STICK)

C1 [ I or T ] to be, or make something, unable to move:

The door jammed behind me and I couldn't get out
[ + obj + adj ] He jammed the window open with a piece of wood.

[ T ] to stop radio signals from reaching the people who want to receive them:

Foreign radio broadcasts were regularly jammed.

jam verb (FILL)

C1 [ T + adv/prep ] to fill a place completely:

The centre of town was jammed with cars moving at a very slow pace.
The motorway was jammed solid (= the traffic could not move) all morning.

(Definition of “jam” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“jam” in American English

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jamverb

us /dʒæm/ -mm-

jam verb (PUSH)

[ T always + adv/prep ] to push something hard with sudden effort:

[ M ] She jammed on the brakes when the light turned red.

jam verb (PACK)

[ T always + adv/prep ] to pack tightly into a small space:

He jammed the boxes into the trunk of the car.

jam verb (BECOME STUCK)

[ I/T ] to become stuck and unable to move, or to be stuck in something:

[ I ] My key jammed in the lock.
[ T ] Paper was jamming the printer.

jam verb (MUSIC)

[ I ] to play popular music informally with other people, without planning it or practicing together:

He once jammed with Charlie Parker.

jamnoun

us /dʒæm/

jam noun (SITUATION)

[ C ] infml a difficult situation:

She expects her parents to bail her out whenever she gets in a jam.

jam noun (FOOD)

(Definition of “jam” from the Cambridge Academic Content Dictionary © Cambridge University Press)