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Quicksand
Quicksand Quick"sand`, n.
Sand easily moved or readily yielding to pressure;
especially, a deep mass of loose or moving sand mixed with
water, sometimes found at the mouth of a river or along some
coasts, and very dangerous, from the difficulty of
extricating a person who begins sinking into it.
Life hath quicksands, -- Life hath snares!
--Longfellow.
Meaning of Quicksand from wikipedia