| 词组 | jam |
| 释义 | jam [jammed, jammed, jamming] jam on jam on the brakes to suddenly put your foot hard on the brake in order to stop your car: ▪ Panicking, she jammed on the brakes and the car turned in a half circle. jam up 1. jam sth up • jam up sth if a lot of people or vehicles jam up a place, they block it so that it is difficult to move: ▪ You can't get down that street - there's loads of parked cars jamming it up. ▪ So many people were rushing to get out at once, they jammed up the exits. ▪ There's no point going through the centre of town - it'll be jammed up at this time of day. ■ SIMILAR TO: ↑clog up jam up if a place jams up, there are so many people or vehicles there that it becomes blocked and no one can move: ▪ Researchers are testing how quickly after an accident a stretch of highway will jam up. ■ SIMILAR TO: ↑clog up 2. jam up sth • jam sth up if something jams up a machine, it prevents part of it from moving properly and the machine will not work: ▪ The paper keeps getting trapped and jamming up the printer. ▪ The video recorder is jammed up again. jam up if a part of a machine jams up, it no longer works properly because something is preventing it from moving: ▪ If the gun jammed up, the soldiers just had to take it apart and put it back together again. 3. be jammed up against sth to be too close to something or in an uncomfortable position against it, and be unable to move away: ▪ His head was jammed up against the back of the sofa, with Doyle's hand clamped over his mouth. ▪ a tiny room with a single bed jammed up against the fireplace |
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