A civilian organization that supports the resistance movement through covert (secret) actions Such actions include intelligence collection, subversion, sabotage, terror, assassination, and dissemination of propaganda in areas denied to the guerrilla force
a secret group organized to overthrow a government or occupation force beneath the surface of the earth; "water flowing underground" in or into hiding or secret operation; "the organization was driven underground
in or into hiding or secret operation; "the organization was driven underground"
{i} region beneath the ground's surface; secret organization fighting occupational forces or an established government; (British) subway, underground train system; subterranean passage
In a country which is controlled by an enemy or has a harsh government, the underground is an organized group of people who are involved in illegal activities against the people in power. These US dollars were smuggled into the country during the war, to aid the underground
Something that is underground is below the surface of the ground. Solid low-level waste will be disposed of deep underground The plane hit so hard that one engine was buried 16 feet underground. Underground is also an adjective. a run-down shopping area with an underground car park. underground water pipes