bystander (set a)
(n.) one who looks on or observes, a person present but not
taking part
canvass (set a)
(v.) to go through an area in order to procure votes, sales, or
opinions; to go over in detail; to discuss
downtrodden
(adj.) treated unfairly and cruelly, oppressed
erode (set a)
(v.) to wear away gradually, eat away