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(Knots) a knot for hooking tackle to the end of a rope, holding fast when pulled but otherwise loose
[C19: named after Blackwall, former docks in London]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a hitch made with a rope over a hook so that it holds fast when pulled but is loose otherwise.
[1860–65; after Blackwall, a London shipyard]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.