To cover with stars or to mark like stars, poetically describing the studding or ornamentation of a surface with star-like points.
From 'be-' prefix plus 'star,' following the pattern of creating verbs that mean 'to cover with' or 'to make into' the object of the base word.
Poetic language often uses 'be-' verbs to suggest transformation—'bestarred' turns the night sky from a noun into an action, making us feel the active process of stars appearing rather than just seeing static points of light.
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