British spelling: to make something seem greater or more important than it really is, or to increase someone's power or wealth.
From Old French 'aggrandiss-' (to make greater), from Latin 'ad-' (to) and 'grandis' (great). Entered English in the 16th century from French, reflecting historical diplomatic exchanges.
Kings and politicians have been using this word for 500 years to describe inflating their own importance—think of medieval monarchs adding 'Grand' and 'Mighty' to their titles.
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