slackliner
n.— «Rock climber and “slackliner” Dean Potter may have had his moment high atop famed Delicate Arch.…The park also has banned “slacklining”—defined as walking on flat nylon webbing or rope anchored between rock formations, trees or any other natural features.» —“Park tweaks rules after Delicate Arch climb” by Lisa J. Church in Moab Salt Lake Tribune (Utah) May 10, 2006. (source: Double-Tongued Dictionary)
Further reading
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The words tough, through, and dough all end in O-U-G-H. So why don’t they rhyme? A lively new book addresses the many quirks of English by explaining the history of words and phrases. And: have you ever been in a situation where a group makes...