dead letter box

(redirected from dead letter drop)
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dead letter box

or

dead 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
References in periodicals archive ?
Yet this current caper was all so antique -- secret codes, vanishing ink, clandestine radios, dead letter drops and brush by exchanges of identical suitcases.
The young Scot suddenly found himself in the Frederick Forsyth world of secret door-knocks and dead letter drops.
The 59-year-old said his life had been like part of a "bad spy movie" with "dead letter drops in secluded car parks".