D defs.my
Entry 1 sense Webster, 1913

Quicksand

/kwĭk'-săndˌ/ · Quick·sand · IPA /ˈkwɪkˌsænd/
01 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…
  1. 1.
    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.