Gaslight is a 1944 American psychological thriller film directed by George Cukor and starring Ingrid Bergman, Charles Boyer, Joseph Cotten, and 18-year-old Angela Lansbury in an Oscar-nominated screen debut (Best Supporting Actress). The film is adapted from Patrick Hamilton’s play Gas Light (1938), about a woman whose husband slowly manipulates her into believing that she is going insane.
https://en.wikipedia.org/wiki/Gaslight_(1944_film)
Thanks for responding to my question. I knew Gaslight was a movie with Ingrid Bergman, having seen it. I just wondered when the verb gaslight got so popular.