underground.
Below the ground; below the surface of the Earth.
Meaning & usage
Below the ground; below the surface of the Earth.
There is an underground tunnel that takes you across the river.
Hidden, furtive, secretive.
These criminals operate through an underground network.
Of or relating to an art forms (such as music) or subculture that is outside the mainstream, especially one that is unofficial and hidden from the authorities.
underground music
Where this word comes from
From Middle English undergrounde (adverb), equivalent to under + ground or under- + ground. Compare Dutch ondergrond, ondergronds, German Untergrund, Danish undergrunds.
Below the ground.
The tunnel goes underground at this point.
Secretly.
Where this word comes from
From Middle English undergrounde (adverb), equivalent to under + ground or under- + ground. Compare Dutch ondergrond, ondergronds, German Untergrund, Danish undergrunds.
The regions beneath the surface of the earth, both natural (eg. caves) and man-made (eg. mines).
Synonym of subway: a railway that is under the ground.
London Underground
A movement or organization of people who resist political convention.
the French underground during World War II
A movement or organization of people who resist artistic convention.
Where this word comes from
From Middle English undergrounde (adverb), equivalent to under + ground or under- + ground. Compare Dutch ondergrond, ondergronds, German Untergrund, Danish undergrunds.
To route electricity distribution cables underground.
Where this word comes from
From Middle English undergrounde (adverb), equivalent to under + ground or under- + ground. Compare Dutch ondergrond, ondergronds, German Untergrund, Danish undergrunds.
simple past and past participle of undergrind
Where this word comes from
See the etymology of the corresponding lemma form.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.