Jam

1. A sweet mixture of fruit boiled with sugar and allowed to congeal. Often spread on bread or toast or used in jam tarts.
2. A difficult situation.
3. Blockage, congestion.

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

4. An informal, impromptu performance or rehearsal.
5. (by extension) A song; a track.
6. (by extension) An informal event where people brainstorm and collaborate on projects.

1. To get something stuck in a confined space.

   Her poor little baby toe got jammed in the door.

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

   The rush-hour train was jammed with commuters.

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

   A single accident can jam the roads for hours.

4. To block or confuse a broadcast signal.
5. To throw a pitch at or near the batter's hands.

   Jones was jammed by the pitch.

6. To play music (especially improvisation as a group, or an informal unrehearsed session).
7. To injure a finger or toe by sudden compression of the digit's tip.

   When he tripped on the step he jammed his toe.

8. To attempt to score points.

   Toughie jammed four times in the second period.

9. To bring (a vessel) so close to the wind that half her upper sails are laid aback.
10. To give up on a date or some joint endeavour; stand up, chicken out, jam out.

noun

A kind of frock for children.

1. (interior decorating) Either of the vertical components that form the side of an opening in a wall, such as that of a door frame, window frame, or fireplace.
2. Any thick mass of rock that prevents miners from following the lode or vein.