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N-MASS
果酱
Jam is a thick sweet food that is made by cooking fruit with a large amount of sugar, and that is usually spread on bread.
例句
...home-made jam.
自制果酱
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VERB
硬推；硬塞；使劲放
If you jam something somewhere, you push or put it there roughly.
例句
He picked his cap up off the ground and jammed it on his head...
他从地上捡起帽子，猛地扣到头上。
Pete jammed his hands into his pockets.
皮特使劲把手插进口袋里。
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V-ERG
（机器）卡??；使卡住；（使）不能运转
If something such as a part of a machine jams, or if something jams it, the part becomes fixed in position and is unable to move freely or work properly.
例句
The second time he fired his gun jammed...
他开第二枪时枪卡壳了。
A rope jammed the boat's propeller...
一根绳子卡住了船的螺旋桨。
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VERB
（车辆）堵住，堵塞（道路）
If vehicles jam a road, there are so many of them that they cannot move.
例句
Hundreds of departing motorists jammed the roads.
数百名打算驾车离开的司机堵住了道路。
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VERB
（人）塞进，挤进
If a lot of people jam a place, or jam into a place, they are pressed tightly together so that they can hardly move.
例句
Hundreds of people jammed the boardwalk to watch...
数百人挤在木板人行道上观看。
They jammed into buses provided by the Red Cross and headed for safety.
他们挤上红十字会派来的巴士前往安全的地方。
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VERB
干扰（无线电或电子信号）
To jam a radio or electronic signal means to interfere with it and prevent it from being received or heard clearly.
例句
They will try to jam the transmissions electronically.
他们会试图用电子信号对发射进行干扰。
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VERB
使（电话总机）应接不暇；使（电话线）过于繁忙
If callers are jamming telephone lines, there are so many callers that the people answering the telephones find it difficult to deal with them all.
例句
Hundreds of callers jammed the BBC switchboard for more than an hour...
在一个多小时内，成百上千的来电使得英国广播公司的总机应接不暇。
The telephone exchange has been jammed all day with people wanting to buy season tickets.
很多人想买季票，电话总机一天到晚忙个不停。
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N-SING
陷入困境
If someone is in a jam, they are in a very difficult situation.
例句
They were in a real jam, Bob thought glumly.
他们确实遇上麻烦了，鲍勃闷闷不乐地想。
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VERB
（爵士乐手或摇滚乐手）即兴演奏
When jazz or rock musicians are jamming, they are informally playing music that has not been written down or planned in advance.
例句
He was jamming with his saxophone.
他在即兴吹奏萨克斯管。