blackberry (Noun) — Large sweet black or very dark purple edible aggregate fruit of any of various bushes of the genus Rubus.
blackberry (Noun) — Bramble with sweet edible black or dark purple berries that usually do not separate from the receptacle.
blackberry (Noun) — (trademark) a handheld wireless device supporting email, web browsing, text messaging, etc..
blackberry (Verb) — Pick or gather blackberries. ex. "The children went blackberrying"