Decorated or covered with banners; having banners attached or displayed.
From the prefix 'be-' (meaning to cause or cover) combined with 'bannered' (adorned with banners). The 'be-' prefix comes from Old English and was commonly used to create verbs meaning to cover or surround something.
Medieval castles and parade grounds used 'bebannered' to describe celebrations so festive that every surface seemed to wave with cloth—it's a word that captures the visual excess of pageantry and spectacle.
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