Definition of slump :
1. A boggy place.
2. A falling or declining, esp. suddenly and markedly; a falling off; as, a slump in trade, in prices, etc.
3. The gross amount; the mass; the lump.
4. The noise made by anything falling into a hole, or into a soft, miry place.
5. To fall or sink suddenly through or in, when walking on a surface, as on thawing snow or ice, partly frozen ground, a bog, etc., not strong enough to bear the person.
6. To lump; to throw into a mess.
7. To slide or slip on a declivity, so that the motion is perceptible; - said of masses of earth or rock.
8. To undergo a slump, or sudden decline or falling off; as, the stock slumped ten points.
quagmire, go down, natural depression, rectify, castigate, reject, chastise, mire, buoyancy, failure, falloff, eclipse, black out, increase, austerity, even out, trough, nose-dive, boom, set, slide down, consumer confidence, even off, dip, subside, drop down, pass out, cliff, fallow, correct, falling off, slack water, decrease, morass, move, fall away, shrinkage, knock out, impression, chasten, pass, drop-off, even up, credit crunch, turn down, diminish, depressive disorder, crater, slack, wilderness, boom and bust, lull, depreciation, deflation, clinical depression, go under, depression, imprint, adjust, fit, skid, low, refuse, stun, cutback, redress, capitalist, make up, loll, rise, reduction, discipline, cut, lessening, shrink, recession, objurgate, bad hair day, the slow lane, compensate, bury, pass up, quag, slouch, economic crisis, sort out, faint, counterbalance, right, off day, agronomics, dwindle, dive, slackness, fall off, descent, posture
depression (part of speech: noun)
deteriorate (part of speech: verb)
fade, revert, moulder, atrophy, downgrade, regress, degenerate, go downhill, ebb, putrefy, slide, get worse, tergiversate, sink, decay, relapse, fall apart, retrogress, collapse, wither, wilt, slip, worsen, lapse, deteriorate, decline, dilapidate, wane
descend (part of speech: verb)
- My spirits, which had risen considerably during our conversation, dropped with a slump when Jim's big house loomed up ahead. - "32 Caliber", Donald McGibeny.
- Since the little slump we had in August it has taken a new start- and not only war business, at that- the old people are sending in orders again. - "His Family", Ernest Poole.
- The slump is liable to begin any day. - "Brewster's Millions", George Barr McCutcheon.