One of the mysteries of the English language finally explained.
In singular and plural Light that passes through or reveals something. Chiefly figurative and in figurative contexts with reference to the light of knowledge or discovery.
Late 16th century; earliest use found in John Florio (1553–1625), author and teacher of languages. In some forms from through- + light.
thorough light/ˈθʌrə lʌɪt/
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