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English definition of “post office box”

post office box

noun [C]  /ˈpoʊst ˌɔ·fɪs ˌbɑks, ˌɑf·ɪs/ (abbreviation P.O. Box) us  
a small, numbered, locked box at a post office to which letters are delivered
(Definition of post office box from the Cambridge Academic Content Dictionary © Cambridge University Press)
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