Hypertext Webster Gateway: "slipknot"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Slipknot \Slip"knot`\, n.
knot which slips along the rope or line around which it is
made.
From WordNet (r) 1.7 (wn)
slipknot
n : a knot at the end of a cord or rope that can slip along the
cord or rope around which it is made
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