Underground
来自Big Physics
Safin（讨论 | 贡献）2022年4月27日 (三) 03:17的版本 （建立内容为“Category:etymology == wiktionary == [https://en.wiktionary.org/wiki/underground ref] From [https://en.wikipedia.org/wiki/Middle_English Middle English] under…”的新页面）
wiktionary
From Middle English undergrounde(adverb), equivalent to under + ground. Compare Dutch ondergrond, ondergronds, German Untergrund, Danish undergrunds.
etymonline
underground (adv.)
1570s, "below the surface," from under + ground (n.). As an adjective, attested from c. 1600; figurative sense of "hidden, secret" is attested from 1630s; adjectival meaning "subculture" is from 1953, from adjectival use in reference to World War II resistance movements against German occupation, on analogy of the dominant culture and the Nazis. Noun sense of "underground railway" is from 1887 (shortened from phrase underground railway, itself attested from 1834).
