Nautical a loop of rope, chain, etc. or metal collar used to join a yard or gaff to a mast in such a way that it can be moved up and down
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.