To do a controlled descent using a rope; to rappel.
Etymology: German abseilen, ab (down) + seil (rope).
'Abseil' is Britsh and 'rappel' is American. ('Rappel' derives from French.)
I'm American, so we "rappeled" down the brick wall of the gymnasium in junior high.
I ran across 'abseil' in an episode of Archer ("The Archer Sanction").
The below picture is from Wikipedia.