outpost (n.)youdaoicibaDictYouDict[outpost 词源字典]
1757, "military position detached from the main body of troops," from out + post (n.2). Originally in George Washington's letters. Commercial sense of "trading settlement near a frontier" is from 1802. Phrase outpost of Empire (by 1895) in later use often echoes Kipling.[outpost etymology, outpost origin, 英语词源]