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gaslighting

[ gas-lahy-ting ]
/ ˈgæsˌlaɪ tɪŋ /
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noun
the use of psychological manipulation to undermine a person’s faith in their own judgment, memory, or sanity: Gaslighting is not restricted to romantic relationships, but also occurs in friendships and among family members.
the practice of deceiving people through the repetition of a constructed false narrative: It’s not uncommon for victims of gaslighting to argue passionately in favor of the story they’ve been fed.
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Origin of gaslighting

First recorded in 1815–25; gaslight + -ing1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use gaslighting in a sentence

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