canyoningcan‧yon‧ing /ˈkænjənɪŋ/ (also can‧yon‧eer‧ing /ˌkænjəˈnɪərɪŋ $ -ˈnɪr-/ American English) noun [uncountable] 
a sport in which you walk and swim along a fast-moving river at the bottom of a canyon
a sport in which you walk and swim along a fast-moving river at the bottom of a canyon