Etymology
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gas-light (n.)

also gaslight, "light, or a provision for light, produced by combustion of coal gas; a gas-jet," 1808, from (illuminating) gas (n.1) + light (n.). Related: Gas-lighted; gas-lighting; gaslighting

According to Wiktionary, "The verb sense derives from the 1938 stage play Gas Light, in which a husband attempts to convince his wife and others that she is insane by manipulating small elements of their environment."

updated on June 15, 2020

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