The word comes from a 1944 MGM film (from Patrick Hamilton's 1938 stage play Gas Light): a husband dims the gas lamps in the house, then tells his wife she's imagining the change, as one part of a program to have her declared insane. Merriam-Webster made "gaslighting" its word of the year in 2022 after lookups rose 1,740%. Somewhere between the film and the word-of-the-year award, the term stretched to cover nearly any disagreement about the past — which is a problem, because the real pattern deserves a word that still cuts.
Sociologist Paige Sweet interviewed domestic-violence survivors and published "The Sociology of Gaslighting" in the American Sociological Review in 2019. Her finding reframes the phenomenon: gaslighting is not primarily a lying technique. It's a power technique that runs on the target's existing social vulnerabilities.
The practical tell that survives the word's dilution: track the direction of reality-testing. A person merely disagreeing with you invites evidence — "check the texts, ask your sister." A gaslighter works to disqualify the evidence and the witnesses themselves — "your sister hates me," "you know your memory," "you're doing the thing again." Disagreement argues about the world. Gaslighting argues about your equipment for perceiving it.
Overusing the word costs the accuser credibility and hands actual gaslighters a defense ("everyone calls everything gaslighting now"). Calling every misremembered conversation an assault on reality is its own distortion. The skill worth drilling has two edges: recognize the equipment-attack pattern early, and refuse to fire the word at ordinary conflict.
Both edges get reps in the spotting test — two of its twelve messages are clean on purpose, because a defense that flags everything protects nothing. The deeper drills live in World 02, The Circle, where the reality-testing direction flips mid-scene and gets named.