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Etymology 1
From. .

Verb

 * 1) to flood with light, to illuminate
 * 2) to X-ray, to screen
 * 3)  to investigate, analyze
 * 4)  to clear up

Etymology 2
From.

Verb

 * 1) to shine through
 * 2)  to come to light, to become apparent, to show
 * 1)  to come to light, to become apparent, to show