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post-office box

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noun
  1. (in a post office) a locked compartment into which the mail of a box renter is put to be called for. Abbreviation: POB, P.O.B.

Origin of post-office box

An Americanism dating back to 1825–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
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