British spelling: to praise someone or something very highly, either in speech or writing.
From Greek 'eulogia' via French influence on English. The British spelling with 's' reflects historical spelling conventions that favored '-ise' endings in British English until standardization.
British and American English diverged partly due to different printers' preferences in the 1700s—some preferred 's' endings, others 'z' endings, and eventually each region standardized its own preference.
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