The term "high wire" is often used to describe a tightrope performance, but there are many synonyms for this phrase that can be used to add variety to writing. One alternative is "slackline," which refers to a slightly looser version of a tightrope that is often used for balancing and acrobatics. Other possible synonyms include "wirewalking," "stiltwalking," "aerialist," "trapeze artist," and "high-flying acrobat." Each of these phrases conveys the idea of a performer working at great heights with a great deal of skill and control, making them all effective options for writers and speakers looking to add some colorful language to their descriptions.