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A binding or metal shackle around the point and shank of a hook to prevent it from slipping from an eye.
[From mouse, a large mouselike knot on 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 lashing, shackle, etc, for closing off a hook to prevent a load from slipping off
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014