tightrope walkernoun [ C ]
uk/ˈtaɪt.rəʊp ˌwɔː.kər//ˈtaɪt.roʊp ˌwɑː.kɚ/a person who walks along a tightrope (= a tightly stretched wire or rope fixed high above the ground), usually to entertain other people:
One of the best acts at the circus was an amazing tightrope walker.