What is the meaning of jam?

noun

• Preserve of crushed fruit.
• Informal terms for a difficult situation.
  • usage: "he got into a terrible fix"; "he made a muddle of his marriage"
  • synonyms: fix, hole, mess, muddle, pickle, kettle of fish
• A dense crowd of people.
  • synonyms: crush, press
• Deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems.
  • synonyms: jamming, electronic jamming

verb

• Press tightly together or cram.
  • usage: "The crowd packed the auditorium"
  • synonyms: throng, mob, pack, pile
• Push down forcibly.
  • usage: "The driver jammed the brake pedal to the floor"
• Crush or bruise.
  • usage: "jam a toe"
  • synonyms: crush
• Interfere with or prevent the reception of signals.
  • usage: "Jam the Voice of America"; "block the signals emitted by this station"
  • synonyms: block
• Get stuck and immobilized.
  • usage: "the mechanism jammed"
• Crowd or pack to capacity.
  • usage: "the theater was jampacked"
  • synonyms: jampack, ram, chock up, cram, wad
• Block passage through.
  • usage: "obstruct the path"
  • synonyms: obstruct, obturate, impede, occlude, block, close up