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sidelight

[sahyd-lahyt]
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noun
  1. an item of incidental information.
  2. either of two lights carried by a vessel under way at night, a red one on the port side and a green on the starboard.
  3. light coming from the side.
  4. a window or other aperture for light in the side of a building, ship, etc.
  5. a window at the side of a door or another window.

Origin of sidelight

First recorded in 1600–10; side1 + light1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for sidelight

sidelight

noun
  1. light coming from the side
  2. a side window
  3. either of the two navigational running lights used by vessels at night, a red light on the port and a green on the starboard
  4. British either of two small lights on the front of a motor vehicle, used to indicate the presence of the vehicle at night rather than to assist the driver
  5. additional or incidental information
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for 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.

Online Etymology Dictionary, © 2010 Douglas Harper

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