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[gas-lahyt] /ˈgæsˌlaɪt/
light produced by the combustion of illuminating gas.
a gas burner or gas jet for producing this kind of light.
gaslit (def 2).
verb (used with object), gaslighted or gaslit, gaslighting.
to cause (a person) to doubt his or her sanity through the use of psychological manipulation:
How do you know if your partner is gaslighting you?
Origin of gaslight
1800-10; gas + light1; def 4 in reference to the 1944 movie Gaslight, in which an abusive husband secretly and repeatedly dims and brightens the gaslights in the house while accusing his wife of imagining the flickering
Related forms
gaslighted, gaslit, adjective
gaslighting, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for gaslight
Contemporary Examples
Historical Examples
  • A young French officer of Zouaves was coming towards her; his high wrinkled and varnished boots gleamed in the gaslight.

  • And it flourishes by gaslight; by day it is garish and forlorn.

  • A laborer—a large, robust red-bearded man—came forward under the gaslight, and began to speak.

    The Quest Frederik van Eeden
  • I could not stand the gaslight; and then you know what a horrid life it is.

  • All were brilliant with gaslight, and the girl, wrapping her shawl about her—she wore no hat or bonnet—took her accustomed stand.

    A Girl of the People L. T. Meade
  • She took the child's face in her hand and turned it to the gaslight.

    Regiment of Women Clemence Dane
  • The evil-looking instruments gleamed and flashed beneath the gaslight.

    The Slave Of The Lamp Henry Seton Merriman
  • Under the gaslight he saw she had revived a little, and then he made her take his arm.

    Mollie's Prince Rosa Nouchette Carey
British Dictionary definitions for gaslight


a type of lamp in which the illumination is produced by an incandescent mantle heated by a jet of gas
the light produced by such a lamp
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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Contemporary definitions for gaslight

to manipulate someone into questioning their own sanity; to subtly drive someone crazy

Word Origin


Usage Note

slang; gaslighting, n's 21st Century Lexicon
Copyright © 2003-2014, LLC
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Slang definitions & phrases for gaslight



To deceive someone systematically: He set me up and has been gaslighting me

[1950s+; fr the 1944 movie Gaslight, in which a man attempts to drive his wife mad by causing her to mistrust her senses]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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