Quick definitions from WordNet (scrub)
▸ noun: the act of cleaning a surface by rubbing it with a brush and soap and water
▸ noun: dense vegetation consisting of stunted trees or bushes
▸ verb: wash thoroughly ("Surgeons must scrub prior to an operation")
▸ verb: clean with hard rubbing ("She scrubbed his back")
▸ adjective: (of domestic animals) not selectively bred
▸ Also see scrub
▸ noun: the act of cleaning a surface by rubbing it with a brush and soap and water
▸ noun: dense vegetation consisting of stunted trees or bushes
▸ verb: wash thoroughly ("Surgeons must scrub prior to an operation")
▸ verb: clean with hard rubbing ("She scrubbed his back")
▸ adjective: (of domestic animals) not selectively bred
▸ Also see scrub