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