Толковый словарь английского языка Oxford English Reference - jam

1. v. & n. --v.tr. & intr. (jammed, jamming) 1 a tr. (usu. foll. by into) squeeze or wedge into a space. b intr. become wedged. 2 a tr. cause (machinery or a component) to become wedged or immovable so that it cannot work. b intr. become jammed in this way. 3 tr. push or cram together in a compact mass. 4 intr. (foll. by in, on to) push or crowd (they jammed on to the bus). 5 tr. a block (a passage, road, etc.) by crowding or obstructing. b (foll. by in) obstruct the exit of (we were jammed in). 6 tr. (usu. foll. by on) apply (brakes etc.) forcefully or abruptly. 7 tr. make (a radio transmission) unintelligible by causing interference. 8 colloq. (in jazz etc.) extemporize with other musicians. --n. 1 a squeeze or crush. 2 a crowded mass (traffic jam). 3 colloq. an awkward situation or predicament. 4 a stoppage (of a machine etc.) due to jamming. 5 (in full jam session) colloq. improvised playing by a group of jazz musicians. Phrases and idioms jam-packed colloq. full to capacity. Derivatives jammer n. Etymology: imit. 2. n. & v. --n. 1 a conserve of fruit and sugar boiled to a thick consistency. 2 Brit. colloq. something easy or pleasant (money for jam). --v.tr. (jammed, jamming) 1 spread jam on. 2 make (fruit etc.) into jam. Phrases and idioms jam tomorrow a pleasant thing often promised but usu. never forthcoming. Etymology: perh. = JAM(1)