1. (noun) jam
preserve of crushed fruit
2. (noun) fix, hole, jam, mess, muddle, pickle, kettle of fish
informal terms for a difficult situation
"he got into a terrible fix"; "he made a muddle of his marriage"
3. (noun) crush, jam, press
a dense crowd of people
4. (verb) jamming, electronic jamming, jam
deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems
5. (verb) throng, mob, pack, pile, jam
press tightly together or cram
"The crowd packed the auditorium"
6. (verb) jam
push down forcibly
"The driver jammed the brake pedal to the floor"
7. (verb) jam, crush
crush or bruise
"jam a toe"
8. (verb) jam, block
interfere with or prevent the reception of signals
"Jam the Voice of America"; "block the signals emitted by this station"
9. (verb) jam
get stuck and immobilized
"the mechanism jammed"
10. (verb) jam, jampack, ram, chock up, cram, wad
crowd or pack to capacity
"the theater was jampacked"
11. (verb) obstruct, obturate, impede, occlude, jam, block, close up
block passage through
"obstruct the path"
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Definition of 'JAM' 
