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an address consisting of the number of a PO Box (=an address you use instead of your real address)
post office box: used in an address showing the number of a small box at a post office where letters for you can be sent
British a group of numbers, or letters and numbers, that you write at the end of a person’s address to help the postman find the exact area where they live. The usual American word is zip code.
be reversed; be as if it had never happenedadd a word