What is the meaning of Brush?

An instrument composed of bristles, or other like material, set in a suitable back or handle, as of wood, bone, or ivory, and used for various purposes, as in removing dust from clothes, laying on colors, etc. Brushes have different shapes and names according to their use; as, clothes brush, paint brush, tooth brush, etc.

Source: Webster’s Revised Unabridged Dictionary (1913), via OPTED