单词	jam
释义	verb | noun jamjam1 /dʒæm/ ●●○ verb Verb Table VERB TABLE jam Simple Form Present I, you, we, they jam he, she, it jams Past I, you, he, she, it, we, they jammed Present perfect I, you, we, they have jammed he, she, it has jammed Past perfect I, you, he, she, it, we, they had jammed Future I, you, he, she, it, we, they will jam Future perfect I, you, he, she, it, we, they will have jammed Continuous Form Present I am jamming he, she, it is jamming you, we, they are jamming Past I, he, she, it was jamming you, we, they were jamming Present perfect I, you, we, they have been jamming he, she, it has been jamming Past perfect I, you, he, she, it, we, they had been jamming Future I, you, he, she, it, we, they will be jamming Future perfect I, you, he, she, it, we, they will have been jamming 1PUSH HARD [transitive] to push something somewhere using a lot of force, until it can go no further: jam something into/under/on something Mr. Braithe jammed the letters into his pocket and left.2BLOCK [transitive] (also jam up) if a lot of people or vehicles jam a place, they block it so that it is difficult to move:  Crowds of supporters jammed the lobby.3MACHINE [intransitive, transitive] (also jam up) if a machine jams or you jam it, it stops working because part of it is stuck:  The pilot reported that his controls had jammed.4MUSIC [intransitive] eng. lang. arts to play music in an informal way with others for fun, without practicing first:  We were jamming with Max’s band last night. → see also jam session5SIGNAL/BROADCAST [transitive] to deliberately prevent broadcasts or other electronic signals from being received, by broadcasting other signals on the same wavelength:  The electronic equipment jams enemy radar signals.6jam a switchboard if telephone calls jam a switchboard, so many people are telephoning the same organization that its telephone system cannot work correctly7jam on the brakes to suddenly put your foot down hard on the brake to stop a car → see also jammed verb | noun jamjam2 ●●○ noun Etymology ETYMOLOGYjam2 Origin: 1700-1800 Perhaps copying the action Collocations COLLOCATIONS► a traffic jam  Sorry we’re late. We got stuck in a traffic jam. 1 [countable, uncountable] a thick sweet sticky substance made from boiled fruit and sugar and eaten especially on bread:  strawberry jam2[countable] a situation in which it is difficult or impossible to move because there are so many cars or people:  Sorry we’re late. We got stuck in a traffic jam.3be/get in a jam informal to be or become involved in a difficult or uncomfortable situation:  Can you help me out? I’m kind of in a jam.4[countable usually singular] a situation in which something is stuck somewhere:  a jam in the copy machine5[countable usually singular] a jam session
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