UNDERGROUND

n. a. adv.

4 definitions — Webster’s Dictionary (1828)

1.
n.

The place or space beneath the surface of the ground; subterranean space. A spirit raised from depth of underground. Shak.

2.
a.

Being below the surface of the ground; as, an underground story or apartment.

3.
a.

Done or occurring out of sight; secret. [Colloq.] Underground railroad or railway. See under Railroad.

4.
adv.

Beneath the surface of the earth.

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