In the manner or fashion of a banner; arranged or positioned like a banner.
From 'banner' + '-wise' (suffix meaning 'in the manner of'). The '-wise' suffix comes from Old English and creates adverbs, as in 'clockwise' and 'likewise.'
The '-wise' suffix is ancient—it appears in Old English texts meaning 'manner' or 'direction,' which is why 'clockwise' works even though clocks are modern: the suffix itself carries the sense of 'which way' or 'how.'
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