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underground Definition

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underground
adverb(un-der-ground)
beneath the surface of the earth
underground
adverb(un-der-ground)
in or into hiding or secret operation
underground
noun(un-der-ground)
a subterranean space or channel
underground
noun(un-der-ground)
an underground city railway system
underground
noun(un-der-ground)
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
adjective(un-der-ground)
being, growing, operating, or situated below the surface of the ground
underground
adjective(un-der-ground)
conducted by secret means
underground
adjective(un-der-ground)
existing outside the establishment
underground
noun(un-der-ground)
a system of cooperation among active antislavery people in the U.S. before 1863 by which fugitive slaves were secretly helped to reach the North or Canada —called also Underground Railway
underground
idiom(un-der-ground)
to start working in secret
underground
noun(un-der-ground)
a group of people who secretly work to oppose or overthrow a government

Words Related to underground!

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underground Examples by Brain Bank Users