verb (used without object)
to drop or fall heavily; collapse: Suddenly she slumped to the floor.
to assume a slouching, bowed, or bent position or posture: Stand up straight and don't slump!
to decrease or fall suddenly and markedly, as prices or the market.
to decline or deteriorate, as health, business, quality, or efficiency.
to sink into a bog, muddy place, etc., or through ice or snow.
to sink heavily, as the spirits.
an act or instance of slumping.
a decrease, decline, or deterioration.
a period of decline or deterioration.
any mild recession in the economy as a whole or in a particular industry.
a period during which a person performs slowly, inefficiently, or ineffectively, especially a period during which an athlete or team fails to play or score as well as usual.
a slouching, bowed, or bent position or posture, especially of the shoulders.
a landslide or rockslide.
the vertical subsidence of freshly mixed concrete that is a measure of consistency and stiffness.
New England Cookery. a dessert made with cooked fruit, especially apples or berries, topped with a thick layer of biscuit dough or crumbs.

1670–80; orig., to sink into a bog or mud; perhaps imitative (cf. plump2)

unslumped, adjective
unslumping, adjective

8. lapse, reverse, setback. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
slump (slʌmp)
1.  to sink or fall heavily and suddenly
2.  to relax ungracefully
3.  (of business activity, etc) to decline suddenly; collapse
4.  (of health, interest, etc) to deteriorate or decline suddenly or markedly
5.  (of soil or rock) to slip down a slope, esp a cliff, usually with a rotational movement
6.  a sudden or marked decline or failure, as in progress or achievement; collapse
7.  a decline in commercial activity, prices, etc
8.  economics another word for depression
9.  the act of slumping
10.  a slipping of earth or rock; landslide
[C17: probably of Scandinavian origin; compare Low German slump bog, Norwegian slumpa to fall]

Slump (slʌmp)
the Slump another name for the Depression

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1677, "fall or sink into a muddy place," probably from a Scand. source, cf. Norw. and Dan. slumpe "fall upon," Swed. slumpa; perhaps ultimately of imitative origin. The noun meaning "heavy decline in prices on the stock exchange" is from 1888; generalized to "sharp decline in trade or business" 1922.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
While there has been a big slump recently in the retail price of sugar, the
  price at refineries has not dropped.
The slump may also exacerbate economic pressures that can damage the
  environment, he added.
Of course every actual slump has particular causes of its own but certain
  general causes are always present.
Amid a flash of fireworks, what's left of him falls to the ground in an
  anticlimactic slump.
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