Sailor climbing banks? I'm coming down

• Person climbing down depends on people flying up
• Downward climber
• A person who descends down a nearly vertical face by using a doubled rope that is wrapped around the body and attached to some high point
• Sailor upset banks: he’s let himself down?

WordNet Word definitions in WordNet
n. a person who descends down a nearly vertical face by using a doubled rope that is wrapped around the body and attached to some high point

Wiktionary Word definitions in Wiktionary
n. Someone who abseils.