undergroundadv.
英 ʌndə'graʊnd | 美 ,ʌndə'ɡraʊnd
中文adv. 在地下；秘密地\nadj. 地下的；秘密的；先锋派的\nn. 地下；地铁；地道；地下组织；秘密活动；先锋派团体
在地下；秘密地
adj. 地下的；秘密的；先锋派的
n. 地下；地铁；地道；地下组织；秘密活动；先锋派团体
词根词源
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).
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