1. 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 colours, etc. Brushes have different shapes and names according to their use; as, clothes brush, paint brush, tooth brush, etc.
7. The act of brushing; as, to give one's clothes a brush; a rubbing or grazing with a quick motion; a light touch; as, we got a brush from the wheel as it passed. [As leaves] have with one winters brush fell from their boughts. (Shak)
9. A short contest, or trial, of speed. Let us enjoy a brush across the country. (Cornhill Mag) electrical brush, a form of the electric discharge characterised by a brushlike appearance of luminous rays diverging from an electrified body.