From Longman Dictionary of Contemporary Englishsandcastlesand‧cas‧tle /ˈsændˌkɑːsəl $ -ˌkæ-/ noun [countable] DLOa small model of a castle, made out of sand by children playing on a beach
Examples from the Corpus
sandcastle• In Blackpool, sandcastles were replaced by sandbags - handed out to hoteliers and shopkeepers on the flooded prom.• Will I ever build sandcastles again?• The citadel's rough, sheer pale-brown outer walls and ramparts resemble a giant sandcastle built on the edge of the sea.• Bombs falling on cities, houses crumbling like sandcastles.• Children's sandcastles and hearts in love have disintegrated at its edge. 