What's the name of this George Cukor psychological thriller about a man who gradually manipulates his wife into believing that she is insane?

Based on Patrick Hamilton's play Gas Light (1938), Gaslight stars Charles Boyer and Ingrid Bergman in the lead roles. The chilling tale had such a lasting effect on audiences that the term gaslighting (meaning to lead someone to question their own reality) became part of the common lexicon, and is more applicable today than ever.

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