A more psychological definition of gaslighting is "an increasing frequency of systematically withholding factual information from, and/or providing false information to, the victim - having the gradual effect of making them anxious, confused, and less able to trust their own memory and perception.
Or maybe your boss gets angry because you didn't prepare the report he asked you to. When you remind him that he usually prepares that particular report, he snaps that he told you to take care of it a few days ago because he was too busy. However, you know he never asked you to do so.
Both of these could be considered gaslighting.
2. to give a person the frustration of moving their keys, purse, wallet, condoms, or other object and to then claim they were never moved or the person had done it themself
3. a frequent tool in the slickery dick or slickery clit's toolkit for infidelity
4. an insidious tool in the hands of unscrupulous mind-screwers and sociopaths
5. to tell a lie (consciously or unconsciously) without regard for whether or not you undermine another person's sanity/ perception of reality
It comes from the 1938 movie Gas Light.
Courtney Love leveled Kurt Cobain, not just with the multiple affairs, but by gently undermining his self respect with a little known procedure called gas lighting. He didn't even know he was a pound overweight until he was 20 pounds overweight. Poor guy.
It is a sign of the slow progress of culture that something as insidious as gas lighting can fail to be widely known, except in a slang dictionary definition, nearly three quarters of a century later than the movie by the same name.
Some believe this terminology roots back to the operation of a gas lantern and how it can be turned down in an instant as not to waste fuel (i.e. a persons time) and then turned back up once there is insufficient natural light (i.e. there’s no one else to hang with).
Unsuspecting Dupes friend: “Yea, she’s gaslighting you bro’.”