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castle

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castle/ˈkæsəl/
British/ˈkɑːsəl/noun
pluralcastles
castle
/ˈkæsəl/British/ˈkɑːsəl/
noun
pluralcastles
Learner's definition of CASTLE  
[count]
: a large building usually with high, thick walls and towers that was built in the past to protect against attack
informal  : a large expensive house
: a piece in the game of chess that looks like a castle tower : rook
— see picture at chess

castle in the air

alsocastle in Spain
: a dream, plan, or idea that can never become real — usually plural
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