robber trench

robber trench

n
(Archaeology) archaeol a trench that originally contained the foundations of a wall, the stones of which have been taken away
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

robber trench

A trench at an archaeological site that originally contained stones that made up the foundation of a wall but which were taken away for some later use.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited