| 单词 | underground | 
| 释义 | Word Frequency undergroundadjective (ˈʌndəˌɡraʊnd) 1.  occurring, situated, or used below ground level   an underground tunnel  an underground explosion 2.  secret; hidden   underground activities adverb (ˌʌndəˈɡraʊnd) 3.  going below ground level  the tunnel led underground 4.  into hiding or secrecy   the group was driven underground noun (ˈʌndəˌɡraʊnd) 5.  a space or region below ground level 6.  a.  a movement dedicated to overthrowing a government or occupation forces, as in the European countries occupied by the German army in World War II b.  (as modifier)  an underground group 7. the underground  8. (usually preceded by the) a.  any avant-garde, experimental, or subversive movement in popular art, films, music, etc b.  (as modifier)  the underground press  underground music  | 
	
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