What does "underground" mean?
Underground: Being below the surface of the ground; as, an underground story or apartment.
Additional senses
- 2.Done or occurring out of sight; secret. [Colloq.] Underground railroad or railway. See under Railroad.
- 3.Beneath the surface of the earth.
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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- Published: 2026-07-17T00:00:00-07:00 · Modified: 2026-07-17T00:00:00-07:00