Resembling or having the qualities of a banner; fluttering or flowing like a banner.
From 'banner' + '-like' (suffix meaning 'resembling'). The '-like' suffix is highly productive in English for creating similes, as in 'dreamlike,' 'ghostlike,' and 'cloud-like.'
Writers love 'bannerlike' to describe fabric in motion—it evokes flowing, dramatic movement, which is why poets use it for capes, hair, and waves rather than static cloth.
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