what does atticus mean by ghosts when he tells scout there are "other ways of making people into ghosts." And what "ways" might he have in mind?

Atticus means that a person doesn't have to die to become a ghost....... a person can be ostracized, they can willingly shut themselves away,or they can be forcibly shut away by other. Regardless, they become shadows of their former selves and take on the traits of what we describe as ghosts. People talk about ghosts, are frightened of ghosts, and make-up or exaggerate stories about ghosts.