Etymology
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sidelight (n.)

also side-light, c. 1600, "light coming from the side," from side (adj.) + light (n.). Figurative meaning "incidental information on a subject" is attested from 1862.

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Definitions of sidelight

sidelight (n.)
light carried by a boat that indicates the boat's direction; vessels at night carry a red light on the port bow and a green light on the starboard bow;
Synonyms: running light
From wordnet.princeton.edu