verb
jams; jammed; jamming
to fill (a place) completely [+ obj]
[+ obj] :to fill (something, such as a door or a road) so that movement is slow or stopped
[+ obj] :to press or push (an object) into a tight place
to push (a part of your body, a lever, etc.) suddenly and forcefully [+ obj]
[+ obj] :to cause (a part of your body) to be painfully crushed, squeezed, etc.
[no obj] :to stop working properly because something inside prevents movement
[+ obj] :to cause (something) to stop working properly by preventing its parts from moving
[+ obj] :to make (a radio signal or broadcast) impossible to understand by sending out signals or messages that weaken or block it
[no obj] :to play music informally together without preparation
[+ obj] baseball :to throw a pitch that is close to a batter and that the batter is unable to hit well
noun
plural jams
[count] a situation in which a machine does not work properly because something inside prevents its parts from moving
a situation in which something (such as a road) is so filled that movement is stopped or slowed
informal :a difficult situation
noun
plural jams
[count, noncount] :a sweet food made of fruit and sugar thickened by boiling
money for jam