To remove castellations (a pattern of square indentations or battlements) from a fortified structure or object.
From the prefix 'de-' (remove) + 'castellate' (to furnish with battlements or castles, from 'castellum,' Latin for castle). This term appears in architectural and fortification contexts.
Medieval kings would decastellate conquered fortifications to prevent rebels from re-using them—removing the battlements transformed powerful weapons into mere stone buildings, literally dismantling the architecture of rebellion.
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