underground
UK /ˌʌn.dəˈɡɹaʊnd/ · US /ˌʌn.dəɹˈɡɹaʊnd/ adjective, adverb, noun, verb, proper noun
Forms undergrounds undergrounding undergrounded the Underground under ground under-ground
- adjective (not comparable) Below the ground; below the surface of the Earth. “There is an underground tunnel that takes you across the river.”
- adjective (figurative) Hidden, furtive, secretive. “These criminals operate through an underground network.”
- adjective (figurative) 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”
- adverb Below the ground. “The tunnel goes underground at this point.”
- adverb Secretly.
- noun (geography) The regions beneath the surface of the earth, both natural (eg. caves) and man-made (eg. mines).
- noun (chiefly UK) Synonym of subway: a railway that is under the ground. “London Underground”
- noun (with definite article) A movement or organization of people who resist political convention. “the French underground during World War II”
- noun (with definite article) A movement or organization of people who resist artistic convention.
- verb To route electricity distribution cables underground.
- proper noun (UK, rail transport) The London Underground.
Synonyms
subterranean hypogean belowground covered concealed dark dern hidden invisible inward latent nondisplayed obfuscated obfuscatory obscure obscured occluded occulted private recondite resistance metro tube subway system subway clandestine cloak-and-dagger hole-and-corner hugger-mugger hush-hush
Antonyms
Etymology
From Middle English undergrounde (adverb), equivalent to under + ground or under- + ground. Compare Dutch ondergrond, ondergronds, German Untergrund, Danish undergrunds.
See the etymology of the corresponding lemma form.
Webster’s 1913
- noun The place or space beneath the surface of the ground; subterranean space.
- adjective Being below the surface of the ground; as, an underground story or apartment.
- adjective Done or occurring out of sight; secret. [Colloq.] Underground railroad or railway. See under Railroad.
- adverb Beneath the surface of the earth.
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “underground”, CC BY-SA 4.0. Details