Gaslight (verb)

1. Manipulate (someone) into doubting their own sanity.
2. To manipulate someone by psychological means into questioning their own sanity or reality.

Origin:

1938: from the title of a play gas light (1938), in which a husband tries to make his wife think she is going mad.

Examples:

1. He gaslighted his wife by constantly changing his story and denying events that had occurred.
2. She felt like she was going crazy because her partner gaslighted her constantly.
3. Gaslighting is a form of emotional abuse.
4. Gaslighting can cause serious mental health issues.
5. Gaslighting is a form of manipulation in which the manipulator makes the victim question their own reality.