Prusik knot

noun
Prus·​ik knot | \ prəsik-\

Definition of Prusik knot

: a knot that is used in mountaineering for tying a small sling to a climbing rope as an aid to one who has fallen into a crevasse and that holds fast when weighted but is movable when unweighted

History and Etymology for Prusik knot

from the name Prusik

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