mountaineering to descend a steep slope or vertical drop by a rope secured from above and coiled around one's body or through karabiners attached to one's body in order to control the speed of descent
2.
to descend by rope from a helicopter
—n
3.
an instance or the technique of abseiling
[C20: from German abseilen to descend by a rope, from ab- down + Seil rope]