One of the mysteries of the English language finally explained.
with object To enlighten, especially to shed light on, illuminate (frequently figurative).
Old English. Originally cognate with or formed similarly to Middle Dutch inlichten, Middle Low German inlüchten, Old High German inliuhten, Gothic inliuhtjan from the Germanic base of in- + the Germanic base of light, probably after classical Latin illūmināre illuminate. In later use probably merged with a later formation from en- + light, or perhaps reanalysed as showing en- and light. Compare onlight, alight.
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