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[sahyd-lahyt] /ˈsaɪdˌlaɪt/
an item of incidental information.
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.
light coming from the side.
a window or other aperture for light in the side of a building, ship, etc.
a window at the side of a door or another window.
Origin of sidelight
1600-10; side1 + light1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for sidelight
Contemporary Examples
Historical Examples
  • His eyes looked sunken thus closed, in the sidelight from the carriage-window.

    Shadows of Flames Amelie Rives
  • Our first sidelight on this question came in rather a surprising manner.

    Preventable Diseases Woods Hutchinson
  • As a sidelight on his interest in his mother, I will record one more incident which was told me in Middletown.

    Cox--The Man Roger W. Babson
  • But that is neither here nor there; it is merely a sidelight I am giving you.

    The Copper-Clad World Harl Vincent
  • "I have bought my experience, Ormesby," he said, with a smile which once more flashed a sidelight on his history.

    The Mistress of Bonaventure Harold Bindloss
  • It is a sidelight of life in another 375 part of the world that has to be seen to be understood.

  • Nothing was wrong but the loss of one sidelight, and the car went better than before.

    Our Part in the Great War Arthur Gleason
  • He glanced through the sidelight of the front door, carelessly.

    The Moonlit Way Robert W. Chambers
British Dictionary definitions for sidelight


light coming from the side
a side window
either of the two navigational running lights used by vessels at night, a red light on the port and a green on the starboard
(Brit) 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
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
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Word Origin and History for sidelight

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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