Definition of “gaslight” - English Dictionary

“gaslight” in British English

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gaslightnoun [ C or U ]

uk /ˈɡæs.laɪt/ us /ˈɡæs.laɪt/

gaslightverb [ I or T ]

/ˈɡæs.laɪt/ /ˈɡæs.laɪt/

to trick or control someone by making them believe things that are not true, especially by suggesting that they may be mentally ill:

She had no memory of the incident and thought he was trying to gaslight her.
gaslighting
noun [ U ] /ˈɡæs.laɪ.tɪŋ/ /ˈɡæs.laɪ.tɪŋ/

Gaslighting is a form of psychological abuse.

(Definition of “gaslight” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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