letter box

noun Chiefly British.
a public or private mailbox.

Origin:
1765–75

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
letter box
 
n
1.  a.  a slot, usually covered with a hinged flap, through which letters, etc, are delivered to a building
 b.  a private box into which letters, etc, are delivered
2.  Also called: postbox a public box into which letters, etc, are put for collection and delivery

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Example sentences
Time was when monitoring a suspected dead-letter box involved laborious work by humans.
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