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English definition of “castle”

castle

noun [C] uk   /ˈkɑː.sl̩/ us    /ˈkæs.l̩/
A2 a large strong building, built in the past by a ruler or important person to protect the people inside from attack informal for rook noun

castle

verb [I] uk   /ˈkɑː.sl̩/ us    /ˈkæs.l̩/ specialized
in chess, to make a special move that puts your king in a more protected place at the side of the board
(Definition of castle from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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