Highwire is a term used to describe a TIGHTROPE, which is a rope or wire that is stretched between two points and used as a balancing act. It is often used in circus performances, where performers must balance on the rope while performing stunts. Highwire acts are considered to be one of the most dangerous and thrilling acts in the circus. The term 'highwire' is derived from the fact that the rope is usually suspended high above the ground.