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jam

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verb jam pronunciation in British English /dʒæm/ 
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present tense
I/you/we/theyjam
he/she/itjams
present participlejamming
past tensejammed
past participlejammed
  1. 1
    [transitive] to push someone or something somewhere using a lot of force
    jam someone/something into/on/against something:

    Marilyn jammed the hat firmly on her head and went out.

    Mick jammed a copy of the report into my hand.

    Kirsten was trying to jam all the papers into her bag.

  2. 2
    [transitive] [often passive] if people or things jam a place, there are so many of them that it is difficult to move

    Thousands jammed the area to see the Pope.

    jam someone/something into something:

    Four men were jammed into the back of the car.

    jam something with something:

    The streets were jammed with cars.

  3. 3

    jam

    or

    jam up

    [intransitive] if a machine, lock, window etc jams, it does not work because something stops it from moving

    He fired one shot before his gun jammed.

    1. a.
  4. 4
    [transitive] to injure part of your body because it gets pressed or squeezed between two hard things

    The window suddenly dropped down and jammed her finger.

  5. 5
    [intransitive/transitive] if a telephone system jams or is jammed, it stops working because too many people are making calls at the same time

    Only a few minutes after the programme, the switchboard was jammed with complaints.

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