<unk>  is a form of psychological abuse in which false information is presented with the intent of making a victim doubt his or her own memory and perception. It may simply be the denial by an abuser that previous abusive incidents ever occurred, or it could be the staging of bizarre events by the abuser with the intention of disorienting the victim.
The term<unk> " comes from the play Gas Light and its film adaptations. In those works a character uses a variety of tricks to convince his spouse that she is crazy, so that she won't be believed when she reports strange things that are genuinely occurring, including the dimming of the gas lamps in the house (which happens when her husband turns on the normally unused gas lamps in the attic to conduct clandestine activities there). Since then, it has become a colloquial expression that is now also used in clinical and research literature.
Gaslighting
Mourning
Flight nurse badge
Bedwetting
Web colors
Canning
Bandage
Quench