[QUOTE=elevatedsoul;5524358]gas·light
ˈɡaslīt/
verb
gerund or present participle: gas-lighting

1. manipulate (someone) by psychological means into questioning their own sanity.
   "in the first episode, Karen Valentine is being gaslighted by her husband"
   
   
   

[/Q]

I don't understand what that means. Could you give me an example?