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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
From the M-W Editors
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Origin and Etymology of prusik knot
from the name Prusik
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