The Oxford Thesaurus An A-Z Dictionary of Synonyms - jam v.

1) cram, force, push, wedge, stuff, press, ram, squeeze, shove, pack, crowd: We were jammed in so tightly that we couldn't move. 2) block, obstruct, congest, fill up, clog, plug, stop up: The toilet is jammed with paper again. 3) slam, activate, actuate: I jammed on the brakes. --n. 4) obstruction, blockage, blocking, block, congestion, tie-up, bottleneck, stoppage: She was stuck in a traffic jam for an hour. 5) crush, squeeze, crowd, mob, swarm, multitude, throng, mass, horde, pack, press: You wouldn't believe the jam of football fans at the cup final! 6 trouble, difficulty, predicament, quandary, dilemma, Colloq bind, fix, hole, pickle, hot water, (tight) spot, scrape: Harry helped me out of a jam once, and I won't forget it.