I am looking for a "term" related to curses. The story it was used in was about a woman (a witch?) that was skilled at using words to make people believe they were cursed. She didn't need to put it in action, the words were enough and suficiently powerful that the one on whom they were cast believe it so much that the next missfortune that hit them made them atribute it to the curse.
So it isn't curses actually but how you think about a given situation, having previously been exposed to curse like words.
Does this sound familiar? Do you know to what book or character it refers to?