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Prusik knot

noun Prus·ik knot \ prəsik- \
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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

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Origin and Etymology of prusik knot

from the name Prusik

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