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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 mail for you can be sent
American a series of numbers added to your address to make it easier to deliver letters to you. The British word is postcode.
a combination of a hotdog and a hamburger in a specially designed bread bunBuzzWord Article
high-level diplomats meeting and dining in an informal environment e.g. a party or clubadd a word