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From The Collaborative International Dictionary of English v.0.48:
Jam \Jam\, v. t. [imp. & p. p. Jammed (j[a^]md); p. pr. & vb. n. Jamming.] [Either fr. jamb, as if squeezed between jambs, or more likely from the same source as champ See Champ.] [1913 Webster] 1. 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. [1913 Webster] The ship . . . jammed in between two rocks. --De Foe. [1913 Webster] 2. To crush or bruise; as, to jam a finger in the crack of a door. [Colloq.] [1913 Webster] 3. (Naut.) To bring (a vessel) so close to the wind that half her upper sails are laid aback. --W. C. Russell. [1913 Webster] 4. To block or obstruct by packing too much (people or objects) into; as, shoppers jammed the aisles during the fire sale. [PJC] 5. (Radio) To 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. [PJC] 6. 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. [PJC]