Meaning of “scrub” - Learner’s Dictionary

scrub

noun uk us /skrʌb/
BUSHES [ U ]

bushes and small trees that grow in a dry area

CLEANING [ no plural ]

If you give something a scrub, you clean it by rubbing it with a brush:

I gave my hands a scrub.

(Definition of “scrub noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)