dead letter box
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dead letter box
ordead letter drop
n
(Communications & Information) a place where messages and other material can be left and collected secretly without the sender and the recipient meeting
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014