Why is it called gaslighting?

Why is it called gaslighting?

The term “gaslighting” actually comes from a 1938 play, “Gas Light” (which was turned into a more widely known movie in 1944, “Gaslight”), where a husband manipulates his wife to make her think she’s actually losing her sense of reality so he can commit her to a mental institution and steal her inheritance. Jul 13, 2018

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