underground:1
adverb14th century{ds||1||}
- beneath the surface of the earth
- in or into hiding or secret operation
underground:2
noun1594{ds||1||}
- a subterranean space or channel
- an underground city railway system
- a movement or group organized in strict secrecy among citizens especially in an occupied country for maintaining communications, popular solidarity, and concerted resistive action pending liberation
underground:3
adjective1601{ds||1||}
- being, growing, operating, or situated below the surface of the ground
- conducted by secret means
- existing outside the establishment
Underground Railroad
noun
Underground Railroad
\
1842
- a system of cooperation among active antislavery people in the U.S. before 1863 by which people escaping enslavement were secretly helped to reach the North or Canada
go underground
idiom
go underground
\
- to start working in secret
the underground
noun
the underground
\
- a group of people who secretly work to oppose or overthrow a government
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