gaslight

[gas-lahyt]
noun
1.
light produced by the combustion of illuminating gas.
2.
a gas burner or gas jet for producing this kind of light.
adjective
3.
gaslit ( def 2 ).
verb (used with object), gaslighted or gaslit, gaslighting.
4.
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:
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

gaslighted, gaslit, adjective
gaslighting, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gaslight (ˈɡæsˌlaɪt)
 
n
1.  a type of lamp in which the illumination is produced by an incandescent mantle heated by a jet of gas
2.  the light produced by such a lamp

Collins English Dictionary - Complete & Unabridged 10th Edition
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Dictionary.com's 21st Century Lexicon
Main Entry:  gaslight
Part of Speech:  v
Definition:  to manipulate someone into questioning their own sanity; to subtly drive someone crazy
Etymology:  1956
Usage:  slang; gaslighting, n
Dictionary.com's 21st Century Lexicon
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