1. A kind of frock for children.
  2. See Jamb.
  3. A mass of people or objects crowded together; also, the pressure from a crowd; a crush; as, a jam in a street; a jam of logs in a river.
  4. An injury caused by jamming.
  5. A preserve of fruit boiled with sugar and water; as, raspberry jam; currant jam; grape jam.

v. t.

  1. To press into a close or tight position; to crowd; to squeeze; to wedge in.
  2. To crush or bruise; as, to jam a finger in the crack of a door.
  3. To bring (a vessel) so close to the wind that half her upper sails are laid aback.