To light up or make visible as if with daylight; to illuminate thoroughly.
Combining 'be-' with 'day,' similar to 'bedawn.' Both are archaic or poetic formations showing how the 'be-' prefix could historically transform nouns into verbs meaning 'to cover with' or 'to fill with.'
Old English and Middle English had this incredible flexibility where you could stick 'be-' in front of almost anything to create a new verb—'benight' (to darken), 'bejewel' (to adorn with jewels), 'becalm.' Modern English has mostly stopped doing this, which means we've actually lost some expressive flexibility in our language.
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