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A covered passage, especially one between the transept and chapter house of a cathedral.
[Perhaps akin to Dutch dialectal slijpe, secret path.]
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.
(Architecture) a covered passageway in a cathedral or church that connects the transept to the chapterhouse
[C19: probably from Middle Flemish slijpen to slip]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014