"Gaslighting" is a form of psychological manipulation where one person makes another doubt their own memory, perception, or reality, often to gain power or hide the truth. It originates from a play where a husband tricks his wife into thinking she's losing her sanity ( "Gas Light" ) .

“Gaslighting” is making someone seem or feel unstable, irrational, and not credible, making them feel like what they're seeing or experiencing isn't real, that they're making it up, and that no one else will believe them.