WordReference Random House Unabridged Dictionary of American English © 2017
sand•cas•tle  (sandkas′əl, -kä′səl),USA pronunciation n. 
  1. a small castlelike structure made of wet sand, as by children at a beach.
  2. a plan or idea with little substance.
[1850–55;
sand + castle]


Collins Concise English Dictionary © HarperCollins Publishers::

sand castle n
  1. a mass of sand moulded into a castle-like shape, esp as made by a child on the seashore



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