Gaslighting or gas-lighting is a form of mental abuse in which information is twisted or spun, selectively omitted to favor the abuser, or false information is presented with the intent of making victims doubt their own memory, perception, and sanity. Instances may range simply from the denial by an abuser that previous abusive incidents ever occurred, up to the staging of bizarre events by the abuser with the intention of disorienting the victim.

The term owes its origin to the 1938 play Gas Light and its film adaptations. The term has been used in clinical and research literature.

From: https://en.wikipedia.org/wiki/Gaslighting