/dʒæm ||; dʒæm/verb (
jamming;jammed)
1 [T] jam sb/sth in, under, between, etc sth to push or force sb/sth into a place where there is not much room 把…塞入: She managed to jam everything into her suitcase. 她好不容易才把所有东西塞到手提箱里。
2 [I,T] jam (sth) (up) to become or to make sth unable to move or work 卡住: Something is jamming (up) the machine. 有东西把机器卡住了。The paper keeps jamming in the photocopier. 这复印机老是卡纸。I can't open the door. The lock has jammed. 锁给卡住了，我开不了这门。
3 [T] jam sth (up) (with sb/sth) (usually passive 通常用于被动语态) to fill sth with too many people or things 使挤满（人或物）: The cupboard was jammed full of old newspapers and magazines. 碗柜里塞满了旧报纸和旧杂志。The suitcase was jam-packed with (= completely full of)designer clothes. 手提箱里装满了名牌服装。The switchboard was jammed with calls from unhappy customers. 不满意的顾客打来的电话令总机应接不暇。
4 [T] to send out signals in order to stop radio programmes, etc from being received or heard clearly 干扰（电台广播等）
5 [I] (informal 非正式) to play music with other musicians in an informal way without preparing or practising first 即兴演奏: They continued to jam together and write music and eventually they made their first record. 他们不断一起玩音乐、作曲，最后终于出了第一张唱片。
jam on the brakes/jam the brakes on to stop a car suddenly by pushing hard on the controls(
brakes)with your feet 猛踩煞车