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Definition of jam : 1. A kind of frock for children.
2. 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.
3. A number of things of the same kind, ordinarily used or classed together; a collection of articles which naturally complement each other, and usually go together; an assortment; a suit; as, a set of chairs, of china, of surgical or mathematical instruments, of books, etc.
4. A preserve of fruit boiled with sugar and water; as, raspberry jam; currant jam; grape jam.
5. An injury caused by jamming.
6. See Jamb.
7. To bring ( a vessel) so close to the wind that half her upper sails are laid aback.
8. To crush or bruise; as, to jam a finger in the crack of a door.
9. To press into a close or tight position; to crowd; to squeeze; to wedge in.

Synonyms:

carry, shut up, ram down, hot spot, blank out, crushed leather, plenty, load, jumble, tighten, maw, gob, tamp down, force, embarrass, immobilize, ram, closet, immobilise, fixture, mending, freeze, drive, block up, dummy up, great deal, mechanical press, golf hole, suppress, corner, shell, heap, mussiness, location, spate, stymy, keep mum, full, lot, tamp, mountain, press, pressure, button up, hot water, tidy sum, welter, imperativeness, fill, quagmire, mickle, smother, hollow, backpack, trap, swot up, flock, messiness, localisation, clutter, mess, Dutch, wardrobe, peck, squeeze, jampack, be quiet, crowd, immobilization, break down, take, parry, clam up, fold, raft, pound, stack, throng, public press, chock up, beat, deal, infatuation, crash, multitude, passel, demolish, bundle, halt, wad, host, hatful, occlude, lug, close up, military press, reparation, mend, cram, scrape, smash, kettle of fish, mug up, concourse, deflect, batch, draw a blank, locating, tie-up, soup, jamming, good deal, spot, yap, kibosh, bind, muckle, deep water, compact, compaction, oppress, cakehole, electronic jamming, insistency, calf love, sight, continue, easy, muss, shut down, pack, drum, puppy love, muddle, quite a little, choke up, bone up, stymie, beat out, fill up, squash, pressing, mash, crunch, box, swot, trouble, printing press, mass, forget, mint, mare's nest, jam-pack, squelch, grind away, repair, slew, gridlock, fixing, trounce, pot, load down, crush, localization, obturate, fuddle, close down, block off, mob, insistence, stuff, mess hall, vanquish, belt up, bone, hole, get up, pile

cripple, block, thwart, burden, counter, congest, delay, oppose, baffle, impede, curb, snarl, obstruct, frustrate, crimp, entrap, dam, fetter, constipate, mire, hamper, constrain, complicate, deter, entangle, tangle, clog, snag, paralyze, stop, brake, hamstring, detain, resist, restrain, handicap, stay, bung, foul, bar, impair, bottleneck, choke, interrupt, plug, drag, check, hinder, cramp, restrict, encumber, catch, inhibit

disadvantage, blockade, blockage, bafflement, complication, entrapment, damper, impediment, constraint, deterrent, impedance, encumbrance, hurdle, frustration, inhibition, congestion, restriction, impasse, restraint, interruption, entanglement, resistance, hindrance, opposition, constipation, obstruction, drawback, barrier, stoppage, obstacle

fasten, lock, barricade, shut, latch, close, bolt, secure, join, seal

serenade, play, sing, solo, perform, practice, harmonize, gig

jelly, spread, sweet, marmalade, conserve

ordeal, plight, difficulty, quandary, pickle, fix, dilemma, problem, perplexity, predicament

Usage examples:

• I have got to figure out the likely ones, to see what I can do to jam them. - "Blue-grass and Broadway", Maria Thompson Daviess.
• I'm standing here judging you by the way you break this jam of the jillpokes. - "Joan of Arc of the North Woods", Holman Day.
• You know my thoughts were running on jam; jam is our salvation; of that I have long been convinced. - "Will Warburton", George Gissing.