noun A thicket or jungle, often specified by the name of the prevailing plant.
oak scrub
noun Vegetation judged to be of inferior quality or of little use to humans, though sometimes thick and impenetrable, growing in poor soil or in sand; also, brush.
noun One of the common livestock of a region of no particular breed or not of pure breed, especially when inferior in size, etc.; particularly a male animal poorly suited for breeding.
noun One who labors hard and lives meanly.
noun One who is incompetent or unable to complete easy tasks.
Wow, she really scored 0? What a scrub!
noun One not on the first team of players; a substitute.
noun A player who whines when outmatched by other players, sometimes by blaming the game mechanics or even accusing the other players of cheating.