Definition of "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."
verb: postpone indefinitely or annul something that was scheduled
"We had to scrub our vacation plans."
adjective: (of domestic animals) not selectively bred