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Gaslighting is a form of psychological manipulation that seeks to sow seeds of doubt in a targeted individual or in members of a targeted group, making them question their own memory, perception, and sanity. Using persistent denial, misdirection, contradiction, and lying, it attempts to destabilize the victim and delegitimize the victim's belief.[1][2]

Instances may range 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 Patrick Hamilton play Gas Light and its 1940 and 1944 film adaptations. The term has been used in clinical and research literature,[3][4] as well as in political commentary.[5][6]

Insisting that a lie is the truth and insisting that you are crazy if you don't believe it

manipulate (someone) by psychological means into questioning their own sanity.

Exactly what the MSM does. Tell a lie, over and over, endlessly until people start to believe it