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Meaning of sandcastle

sand•cas•tle

Pronunciation: (sand'kas"ul, -kä"sul), [key]
— n.
  1. a small castlelike structure made of wet sand, as by children at a beach.
  2. a plan or idea with little substance.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.