"My feeling is that he, Gable, and whoever else in this have been trying to gaslight the president." "Why would anyone want to make my husband think he's lost his mind?"
-- Jeff Rovin, Divide and Conquer: Tom Clancy's Op-Center, 2000
If Howard was more energetic and imaginative, I would suspect him of an elaborate plot to gaslight me.
-- Katharine Weber, True Confections, 2010
Gaslight comes from a 1944 film of the same name in which a husband secretely and repeatedly dims and brightens the gaslights in the house while accusing his wife of imaginging the flickering. This movie was based on a play by Patrick Hamilton. The verb entered English in the mid-1900s.