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castle

noun
  1. interchanging the positions of the king and a rook
    castling
  2. a large building formerly occupied by a ruler and fortified against attack
  3. the piece in chess that can move any number of unoccupied squares in a direction parallel to the sides of the chessboard
    “They took my castle in the third move of our game.”
    rook
  4. a large and stately mansion
    palace
verb
  1. to move the king two squares toward a rook and in the same move the rook to the square next past the king