One of the mysteries of the English language finally explained.
1A boy who carries and delivers post; a boy or man who rides express, changing horses at intervals, to deliver letters, dispatches, etc. (now historical). Hence occasionally: a bringer of news; frequently as the title of a newspaper or periodical.
2The postilion of a stagecoach, post-chaise, or hired carriage. Compare "postilion". Now historical.
Late 16th century. From post + boy.
post boy/ˈpəʊs(t) bɔɪ/
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