Pronunciation: /ˈgaslʌɪt/
noun
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a type of lamp in which an incandescent mantle is heated by a jet of burning gas: an era of gaslights and horse-drawn carriages
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[mass noun] the light produced by a gaslight: in the gaslight she looked paler than ever
verb (gaslights, gaslighting, gaslighted)
[with object]-
manipulate (someone) by psychological means into doubting their own sanity: in the first episode, Karen Valentine is being gaslighted by her husband[from the storyline of the film Gaslight (1944), in which a man psychologically manipulates his wife into believing that she is going insane]