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Related to snatch block: sheave block
A block that can be opened on one side to receive the looped part of a rope.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Nautical Terms) nautical a block that can be opened so that a rope can be inserted from the side, without threading it through from the end
[C17: so called because the rope can be inserted quickly: figuratively, the block snatches it. See snatch]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a block that can be opened to receive the bight of a rope at any point along its length.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.