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From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] Life hath quicksands, -- Life hath snares! --Longfellow. [1913 Webster]