British variant spelling of disluster; to make something lose its shine or brightness.
From dis- + lustre (British spelling of luster, from Latin lustrum). This represents the British convention of spelling with -re instead of -er at the end of words.
British and American English differ here: Americans 'disluster' while the British 'dislustre'—it's a tiny spelling difference that reveals how colonial history split English into regional variants.
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