Underground definitions

ŭn'dər-ground'
Situated, occurring, or operating below the surface of the earth.

Underground caverns; underground missile sites.

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Of or relating to an avant-garde movement or its films, publications, and art, usually privately produced and of special appeal and often concerned with social or artistic experiment.
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Hidden or concealed; clandestine.

Underground resistance to the tyrant.

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Of or relating to an organization involved in secret or illegal activity.

Underground trade in weapons.

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A clandestine, often nationalist, organization fostering or planning hostile activities against, or the overthrow of, a government in power, such as an occupying military government.
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A subway system.
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An avant-garde movement or publication.
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Below the surface of the earth.
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In secret; stealthily.
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To situate under the ground.

Workers undergrounding telephone lines.

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Occurring, working, placed, used, etc. beneath the surface of the earth.
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Secret; hidden; undercover.
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Designating or of newspapers, films, music, etc. that are unconventional, experimental, radical, etc.
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Beneath the surface of the earth.
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In or into secrecy or hiding; so as to be undercover; surreptitiously.
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The entire region beneath the surface of the earth.
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An underground space or passage.
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A secret movement organized in a country to oppose or overthrow the government in power or enemy forces of occupation.
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An underground movement in media, films, music, etc.
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A subway.
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(not comparable) Below the ground; below the surface of the Earth.

There is an underground tunnel that takes you across the river.

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Hidden, furtive, secretive.

These criminals operate through an underground network.

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Of music, art, etc, outside the mainstream.
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Below the ground.

The tunnel goes underground at this point.

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Secretly.
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(chiefly UK) An underground railway.
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(with "the") A movement or organisation of people who resist political convention.
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(with "the") A movement or organisation of people who resist artistic convention.
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To route electricity distribution cables underground.
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(UK) The London Underground.
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Origin of underground