jam1/dʒæm; dʒæm/n 1 [C,U] a thick sticky sweet food made from fruit 果酱: raspberry jam 山莓酱a jam sandwich 果酱三明治2 [C] a situation in which it is difficult to move because there are too many people, cars etc 拥挤﹔堵塞TRAFFIC JAM
jam2v jammed , jamming 1 [T] to push something somewhere using a lot of force until it cannot move any further 用力推挤﹔硬塞: I managed to jam everything into one suitcase. 我设法把所有东西都塞进了一个手提箱里。A chair had been jammed up against the door. 门用一把椅子顶住了。 2 [I,T] if a machine, door etc jams, or if you jam it, it no longer works properly because something is stopping one of its parts from moving (使)发生故障﹐(使)卡住: Every time I try to use the fax, it jams. 我每次用传真机它都会卡住。3 [T] if a lot of people or things jam a place, they fill it so that no one or nothing can move〔人或物〕挤满﹔挤进: Excited football fans jammed the streets. 兴奋的足球迷挤到街上。4 [I] to play music with other people in an informal way〔和别人一起〕即兴演奏5 [T] to deliberately block radio signals 干扰〔无线电信号〕 —jammed adj : The door is jammed again. 门又卡住了。