Meaning

• A sweet mixture of fruit boiled with sugar and allowed to congeal. Often spread on bread or toast or used in jam tarts.

• A difficult situation.

• Blockage, congestion.

  "A traffic jam caused us to miss the game's first period."

• An informal, impromptu performance or rehearsal.

• (by extension) A song; a track.

• (by extension) An informal event where people brainstorm and collaborate on projects.

Meaning

• To get something stuck in a confined space.

  "Her poor little baby toe got jammed in the door."

• To brusquely force something into a space; cram, squeeze.

  "The rush-hour train was jammed with commuters."

• To cause congestion or blockage. Often used with "up"

  "A single accident can jam the roads for hours."

• To block or confuse a broadcast signal.

• To throw a pitch at or near the batter's hands.

  "Jones was jammed by the pitch."

• To play music (especially improvisation as a group, or an informal unrehearsed session).

• To injure a finger or toe by sudden compression of the digit's tip.

  "When he tripped on the step he jammed his toe."

• To attempt to score points.

  "Toughie jammed four times in the second period."

• To bring (a vessel) so close to the wind that half her upper sails are laid aback.

• To give up on a date or some joint endeavour; stand up, chicken out, jam out.