quicksand

[kwik-sand]
noun
a bed of soft or loose sand saturated with water and having considerable depth, yielding under weight and therefore tending to suck down any object resting on its surface.

Origin:
1275–1325; Middle English qwykkesand. See quick, sand

quicksandy, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
quicksand (ˈkwɪkˌsænd)
 
n
a deep mass of loose wet sand that submerges anything on top of it

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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Etymonline
Word Origin & History

quicksand
1400, from M.E. quyk "living" (see quick) + sond "sand." O.E. had cwecesund, but this may have meant "lively strait of water."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
quicksand   (kwĭk'sānd')  Pronunciation Key 
A deep bed of loose, smoothly rounded sand grains, saturated with water and forming a soft, shifting mass that yields easily to pressure and tends to engulf objects resting on its surface. Although it is possible for a person to drown while mired in quicksand, the human body is less dense than any quicksand and is thus not drawn or sucked beneath the surface as is sometimes popularly believed.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Ruthless, perhaps, but on the tenure track you can't afford to stop for a dip
  in pools of quicksand.
The pipe sinks into the quicksand, which eventually compacts, leaving no trace
  of the buried pipe.
In the past year, however, the middle ground has begun to resemble quicksand.
If stumbling into quicksand ranks on your list of worries, don't panic.
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