(~s)
Frequency: The word is one of the 3000 most common words in English.
1.
A ~ is a large building with thick, high walls. Castles were built by important people, such as kings, in former times, especially for protection during wars and battles.
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see also sand ~
2.
In chess, a ~ is a piece that can be moved forwards, backwards, or sideways.
= rook
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