castle

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castle /ˈkæsəl/ Brit /ˈkɑːsəl/ noun
plural castles
castle
/ˈkæsəl/ Brit /ˈkɑːsəl/
noun
plural castles
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

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