To make brown; to give something a brown color or appearance.
From the prefix 'em-' (to cause to become) plus 'brown' (the color). A logical but archaic formation following standard English word-building patterns, used sporadically from the 1500s onward.
Like 'embronze,' 'embrown' is a perfectly regular English verb that writers created when needed but that never became standard—language is full of these 'might-have-been' words.
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