QUICKSAND
quicksand
(noun) a pit filled with loose wet sand into which objects are sucked down
quicksand
(noun) a treacherous situation that tends to entrap and destroy
Source: WordNet® 3.1
Etymology
Noun
quicksand (countable and uncountable, plural quicksands)
Wet sand that things readily sink in, often found near rivers or coasts
Anything that pulls one down or buries one metaphorically
Source: Wiktionary
Quick"sand`, n.
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition