scrub

nouns

dense vegetation consisting of stunted trees or bushes
is derived from
the act of cleaning a surface by rubbing it with a brush and soap and water

verbs

clean with hard rubbing
"She scrubbed his back"
is derived from
is derived from
is derived from
wash thoroughly
"surgeons must scrub prior to an operation"
postpone indefinitely or annul something that was scheduled
"Call off the engagement"; "cancel the dinner party"; "we had to scrub our vacation plans"; "scratch that meeting--the chair is ill"

adjectives

(of domestic animals) not selectively bred
is similar to
not made more desirable or valuable or profitable; especially not made ready for use or marketing
"taxes on unimproved land are low"; "unimproved dirt roads"