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English definition of “jam”

jam

noun uk   /dʒæm/ us  

jam noun (FOOD)

A2 [C or U] (US also jelly) a sweet, soft food made by cooking fruit with sugar to preserve it. It is eaten on bread or cakes: strawberry/raspberry jam jam sandwiches

jam noun (ON A ROAD)

B2 [C] → traffic jam: We were stuck in a jam for two hours.

jam noun (BLOCK)

C1 [C] something that is stuck in a machine, or that prevents the parts of a machine from moving: She fed the documents into the machine making sure that there were no paper jams.

jam noun (DIFFICULT SITUATION)

[S] informal a difficult situation: I'm in a bit of a jam - could you lend me some money till next week? How are we going to get ourselves out of this jam?

jam noun (NO SPACE)

[S] a situation in which a lot of people are in a small space: It's a real jam inside - it took me ten minutes to get to the bar.

jam

verb uk   /dʒæm/ (-mm-) us  

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 (MUSIC)

[I] to play jazz or rock music with other people informally without planning it or practising together

jam verb (PUSH)

[T + adv/prep] to push something forcefully or with difficulty into something else: He jammed the boxes into the back of the car.

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 Learners Dictionary & Thesaurus © Cambridge University Press)
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