gaslight

[ gas-lahyt ]
/ ˈgæsˌlaɪt /

noun

light produced by the combustion of illuminating gas.
a gas burner or gas jet for producing this kind of light.

adjective

verb (used with object), gas·light·ed or gas·lit, gas·light·ing.

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 formsgas·light·ed, gas·lit, adjectivegas·light·ing, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for gaslight

British Dictionary definitions for gaslight

gaslight

/ (ˈɡæsˌlaɪt) /

noun

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