Scrub

1. A worn-out brush.
2. A thicket or jungle, often specified by the name of the prevailing plant; as, oak scrub, palmetto scrub, etc.
3. One of the common live stock of a region of no particular breed or not of pure breed, esp. when inferior in size, etc.
4. Mean; dirty; contemptible; scrubby.
5. To rub anything hard, especially with a wet brush; to scour; hence, to be diligent and penurious; as, to scrub hard for a living.
6. One who labors hard and lives meanly; a mean fellow.
7. Something small and mean.
8. To rub hard; to wash with rubbing; usually, to rub with a wet brush, or with something coarse or rough, for the purpose of cleaning or brightening; as, to scrub a floor, a doorplate.