(jammed, jamming)
1
- with obj. and adverbial squeeze or pack (someone or something) tightly into a specified space使…挤入, 把…塞入：
four of us were jammed in one compartment
我们四个人挤在一个隔间
people jammed their belongings into cars.
人们把自己的物品塞进汽车内。
1.1
- push (something) roughly and forcibly into position or a space猛推到位：
he jammed his hat on.
他把帽子使劲往头上一扣。
1.2
- with obj. crowd on to (a road) so as to block it堵住, 塞住：
the roads were jammed with traffic.
马路上交通堵塞。
1.3
- with obj. cause (telephone lines) to be continuously engaged with a large number of calls（因大量打进来的电话）使（电话线）总是占线：
listeners jammed a radio station's switchboard with calls.
听众的电话把无线电台总机打爆了。
1.4
- no obj., with adverbial of direction push or crowd into an area or space挤入, 涌入：
75,000 refugees jammed into a stadium today to denounce the accord.
今天75,000名难民涌入体育场谴责该条约。
2
- become or make unable to move or work due to a part seizing or becoming stuck卡住, 轧住, （使）不能动弹：
no obj. the photocopier jammed复印机卡住了
with obj. the doors were jammed open.门被卡住关不上了。
2.1
- with obj. make (a radio transmission) unintelligible by causing interference干扰（无线电广播）。
3
- no obj. informal improvise with other musicians, especially in jazz or blues〈非正式〉与别的乐手一起即兴表演（尤指爵士乐或布鲁斯乐曲）：
the opportunity to jam with Atlanta blues musicians.
与亚特兰大布鲁斯乐手一起即兴表演的机会。
1
- an instance of a machine or thing seizing or becoming stuck（机器或其他物件）卡住, 轧住, 不能动弹：
paper jams.
卡纸。
1.1
- informal an awkward situation or predicament〈非正式〉窘境; 困境：
I'm in a jam.
我左右为难。
1.2
- short for TRAFFIC JAM.TRAFFIC JAM的简称。
1.3
- often with modifier Climbing a handhold obtained by stuffing a part of the body such as a hand or foot into a crack in the rock【登山】可以抓牢的东西, 着力点（如把手或脚插入岩缝）。
2
- （亦作jam session）an informal gathering of musicians improvising together, especially in jazz or blues爵士乐（或布鲁斯音乐）乐手的非正式即兴演奏。
短语
jam on the brakes
- operate the brakes of a vehicle suddenly and forcibly, typically in response to an emergency紧急刹车。
词源
mass noun
1- chiefly Brit. a sweet spread or conserve made from fruit and sugar boiled to a thick consistency〈主英〉果酱。
1.1
- Brit. used in reference to something easy or pleasant〈英〉轻松愉快的事：
they want it all, both ways and with jam on the top.
他们什么都想要, 既要两全其美又要毫不费力。
jammed, jamming
with obj. make (fruit) into jam把（水果）做成果酱。
短语
jam tomorrow
- Brit. a pleasant thing which is often promised but rarely materializes〈英〉允诺而做不到的好事; 可望而不可即的事物：
a promise of jam tomorrow wasn't enough to satisfy them.
口惠而实不至的诺言难以令他们满意。
ORIGIN: phrase from Lewis Carroll's Through the Looking Glass (1871).
词源
mid 18th cent.: perhaps from JAM1.