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sandcastle

[sand-kas-uh l, -kah-suh l]
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noun
  1. a small castlelike structure made of wet sand, as by children at a beach.
  2. a plan or idea with little substance.
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Origin of sandcastle

First recorded in 1850–55; sand + castle
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for sand castle

sand castle

noun
  1. a mass of sand moulded into a castle-like shape, esp as made by a child on the seashore
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012