- Either fr. jamb, as if squeezed between jambs, or more likely from the same source as champ See Champ
- To press into a close or tight position; to crowd; to squeeze; to wedge in; to cram; as, rock fans jammed the theater for the concert.The ship . . . jammed in between two rocks.
- To crush or bruise; as, to jam a finger in the crack of a door.Colloq
- NautTo bring (a vessel) so close to the wind that half her upper sails are laid aback.
- To block or obstruct by packing too much (people or objects) into; as, shoppers jammed the aisles during the fire sale.
- RadioTo interfere with (a radio signal) by sending other signals of the same or nearby frequency; as, the Soviets jammed Radio Free Europe broadcasts for years during the cold war.
- To cause to become nonfunctional by putting something in that blocks the movement of a part or parts; as, he jammed the drawer by putting in too many loose papers; he jammed the lock by trying to pick it.
