WordNet sense 1 (informal terms for a difficult situation):

fix, hole, mess, muddle, pickle, kettle of fish

WordNet sense 2 (a dense crowd of people):

crush, press

WordNet sense 3 (press tightly together or cram):

mob, pack, pile, throng

WordNet sense 4 (crowd or pack to capacity):

cram, ram, wad, jampack, chock up

WordNet sense 5 (block passage through):

block, impede, obstruct, occlude, obturate, close up

WordNet sense 6 (deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems):

jamming, electronic jamming