Tightrope

['taɪtrəʊp] or ['taɪtrop]

(noun.) tightly stretched rope or wire on which acrobats perform high above the ground.

Edited by Helen--From WordNet

The famous Blondin was going to perform on a tightrope in another part of the garden. Mark Twain. The Innocents Abroad.
Thee wath Tightrope, thee wath, and now thee'th nothing—on accounth of fat. Charles Dickens. Hard Times.

Checker: Stan