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English definition of “jam”

jam

verb (STICK)    /dʒæm/ (-mm-)
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.Immobility [T] to stop radio signals from reaching the people who want to receive them: Foreign radio broadcasts were regularly jammed.RadioPreventing and impedingLimiting and restricting
(Definition of jam verb (STICK) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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