underground

Universal Words adjective, adverb, noun adjective [onlybeforenoun] 1 under the surface of the ground: underground passages / caves / streams * underground cables compareOVERGROUND 2 operating secretly and often illegally, especially against a government: an underground resistance movement adverb 1 under the surface of the ground: Rescuers found victims trapped several feet underground. * toxic waste buried deep underground * a network of pipelines running underground 2 in or into a secret place in order to hide from the police, the government, etc: He went underground to avoid arrest. noun 1 (often the Underground) (BrE) (AmE subway) [sing.] an underground railway/railroad system in a city: underground stations * the London Underground * I always travel by underground. compareMETRO, TUBE 2 (the underground) [sing.+sing./pl.v.] a secret political organization, usually working against the government of a country ______________________________ BRITISH/AMERICAN underground / subway / metro / tube A city's underground railway / railroad system is usually called the underground (often the Underground) in BrE and the subway in AmE. Speakers of BrE also use subway for systems in American cities and metro for systems in other European countries. The Metro is the name for the systems in Paris and Washington, D.C. London's system is often called the Tube. ______________________________