English

jam verb definition in How machines work topic from the Oxford Advanced Learner's Dictionary

jam

 verb: How machines work topic
[intransitive, transitive] to become unable to move or work; to make something do this jam (up) The photocopier keeps jamming up. jam something (up) There's a loose part that keeps jamming the mechanism. + adj. The valve has jammed shut. jam something + adj. He jammed the door open with a piece of wood.

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