townyoudaoicibaDictYouDict[town 词源字典]
town: [OE] The ancestral meaning of town is ‘enclosed place’ – amongst its relatives are German zaun ‘hedge, fence’ and Old Irish dūn ‘fort, camp, fortified place’. Its Old English forerunner tūn was used for an ‘enclosure’ or ‘yard’, and also for a ‘building or set of buildings within an enclosure’, hence a ‘farm’. This in due course evolved to a ‘cluster of dwellings’, and by the 12th century the modern English sense of the word was in place (the standard Old English term for ‘town’ was burg, ancestor of modern English borough).

The -ton ending of English place-names goes back in many cases to a time when the word meant ‘farmstead’.
[town etymology, town origin, 英语词源]
town (n.)youdaoicibaDictYouDict
Old English tun "enclosure, garden, field, yard; farm, manor; homestead, dwelling house, mansion;" later "group of houses, village, farm," from Proto-Germanic *tunaz, *tunan "fortified place" (cognates: Old Saxon, Old Norse, Old Frisian tun "fence, hedge," Middle Dutch tuun "fence," Dutch tuin "garden," Old High German zun, German Zaun "fence, hedge"), an early borrowing from Celtic *dunon "hill, hill-fort" (cognates: Old Irish dun, Welsh din "fortress, fortified place, camp," dinas "city," Gaulish-Latin -dunum in place names), from PIE *dhu-no- "enclosed, fortified place, hill-fort," from root *dheue- "to close, finish, come full circle" (see down (n.2)).

Meaning "inhabited place larger than a village" (mid-12c.) arose after the Norman conquest from the use of this word to correspond to French ville. The modern word is partially a generic term, applicable to cities of great size as well as places intermediate between a city and a village; such use is unusual, the only parallel is perhaps Latin oppidium, which occasionally was applied even to Rome or Athens (each of which was more properly an urbs).

First record of town hall is from late 15c. Town ball, version of baseball, is recorded from 1852. Town car (1907) originally was a motor car with an enclosed passenger compartment and open driver's seat. On the town "living the high life" is from 1712. Go to town "do (something) energetically" is first recorded 1933. Man about town "one constantly seen at public and private functions" is attested from 1734.