Verb
descend by means of a rappel
Source: WordNetThe people with whom I grew up in the Vestmannaeyjar carried heaven within themselves; even if it was sixty fathoms at the end of a rope down a cliff, fowling, they were at home in God's City of Zion. Halldór Laxness
The ascent was easy--roping down the mountain would be much more difficult and dangerous Source: Internet
You have to learn how to abseil when you want to do technical climbing Source: Internet