British English spelling of the present participle; performing the action of creating crenels in walls.
British variant of 'crenelating,' formed from 'crenellate' with the progressive '-ing' suffix, maintaining double-'l' throughout the conjugation.
Medieval British stonemasons were technically 'crenellating' while American descendants would say 'crenelating'—same careful work, just spelled fancier across the Atlantic!
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