To cast a shadow on; to cover with shadow or darkness.
From 'be-' + 'shadow.' This variant of 'beshade' uses 'shadow' instead, and the meaning is nearly identical—to darken or obscure something.
You've got 'beshade,' 'beshadow,' and 'beshadowed' all meaning basically the same thing, which shows how writers in the 1600s had multiple ways to say 'darken'—kind of like having both 'dark' and 'darken' available.
Complete word intelligence in one call. Free tier — 50 lookups/day.