Past participle of 'bestrew'; covered or scattered with things spread loosely across a surface.
From 'bestrew' using the old Germanic past participle form '-n' instead of '-ed', showing an archaic variant common in older English and poetry.
In poetry, 'bestrewn' sounds more lyrical and archaic than 'bestrewed,' which is why poets prefer it—'a path bestrewn with flowers' has a more romantic, timeless quality.
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