adj · adv · name · noun · verb · 18 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
Received-Pronunciation:/ˌʌn.dəˈɡɹaʊnd/
Northumbria:/ˌʊn.dɐˈɡɹʊnd/
General-American:/ˌʌn.dəɹˈɡɹaʊnd/
rhymes with -aʊnd
Received-Pronunciation, especially:/ˈʌn.də.ɡɹaʊnd/for the
Southern-England:Recorded audio is listed in the source snapshot.
General-American, especially:/ˈʌn.dəɹ.ɡɹaʊnd/for the
CMU ARPABET:AH1 N D ER0 G R AW2 N D
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
adj
Meaning 1
Below the ground; below the surface of the Earth.
Definition source: English Wiktionary via Wiktextract
Usage: not-comparable
Examples
There is an underground tunnel that takes you across the river.
Meaning relationships
Synonyms: subterranean, hypogean
Antonyms: none provided
2
adj
Meaning 2
Hidden, furtive, secretive.
Definition source: English Wiktionary via Wiktextract
Usage: figuratively
Examples
These criminals operate through an underground network.
Meaning relationships
Synonyms: covered, concealed, dark, dern, hidden, invisible, inward, latent, nondisplayed, obfuscated, obfuscatory, obscure, obscured, occluded, occulted, private, recondite, secluded, secret, secreted, silent, snug, tect, unapparent, underground, undisclosed, veiled, abstruse, behind the scenes, catlike, backroom, stealth, clandestine, cloak-and-dagger, confidential, covert, deep-laid, disguised, furtive, huggermugger, hush-hush, inconspicuous, incognito, low profile, lurksome, lurky, mousy, off-the-books, on the down-low, on the sly, secretive, slinky, sly, sneaky, stealthy, sub rosa, surreptitious, under-the-table, under the radar, under wraps, undercover, unperceived
Antonyms: none provided
3
adj
Meaning 3
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.
Definition source: English Wiktionary via Wiktextract
Usage: figuratively
Examples
underground music
Meaning relationships
Synonyms: alternative, unconventional
Antonyms: mainstream
4
adv
Meaning 4
Below the ground.
Definition source: English Wiktionary via Wiktextract
Examples
The tunnel goes underground at this point.
Meaning relationships
Synonyms: below ground
Antonyms: none provided
5
adv
Meaning 5
Secretly.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: clandestinely, in secret, on the quiet
Antonyms: none provided
6
name
Meaning 6
The London Underground.
Definition source: English Wiktionary via Wiktextract
Usage: UK
Topics: rail-transport, railways, transport
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: Tube
Antonyms: none provided
7
noun
Meaning 7
The regions beneath the surface of the earth, both natural (eg. caves) and man-made (eg. mines).
Definition source: English Wiktionary via Wiktextract
Topics: geography, natural-sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
8
noun
Meaning 8
Synonym of subway: a railway that is under the ground.
Definition source: English Wiktionary via Wiktextract
Usage: UK
Examples
London Underground
Meaning relationships
Synonyms: underground railway, subway
Antonyms: none provided
9
noun
Meaning 9
A movement or organization of people who resist political convention.
Definition source: English Wiktionary via Wiktextract
Usage: with-definite-article
Examples
the French underground during World War II
Meaning relationships
Synonyms: resistance
Antonyms: none provided
10
noun
Meaning 10
A movement or organization of people who resist artistic convention.
Definition source: English Wiktionary via Wiktextract
Usage: with-definite-article
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: avant-garde, counterculture
Antonyms: none provided
11
verb
Meaning 11
To route electricity distribution cables underground.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
12
verb
Meaning 12
simple past and past participle of undergrind
Definition source: English Wiktionary via Wiktextract
Usage: form-of, participle, past
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
13
adjective satellite
Meaning 13
conducted with or marked by hidden aims or methods
an electric railway operating below the surface of the ground (usually in a city)
Definition source: Princeton WordNet 3.0
Examples
in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'
Meaning relationships
Synonyms: metro, tube, subway system, subway
Antonyms: none provided
Broader terms: railway, railroad, railroad line, railway line, railway system
18
noun
Meaning 18
a secret group organized to overthrow a government or occupation force
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: resistance
Antonyms: none provided
Broader terms: revolutionary group
Narrower terms: Maquis
History
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.
Across languages
Translations
176 source translations are retained for this English entry.
Armenian:
ընդերկրյա
(ənderkrya)
— below the ground — see also subterranean
Armenian:
ստորգետնյա
(storgetnya)
— below the ground — see also subterranean
Belarusian:
падзе́мны
(padzjémny)
— below the ground — see also subterranean
Bulgarian:
подзе́мен
(podzémen)
— below the ground — see also subterranean
Catalan:
subterrani
— below the ground — see also subterranean
Chinese Mandarin:
地下
(dìxià)
— below the ground — see also subterranean
Czech:
podzemní
— below the ground — see also subterranean
Dutch:
ondergronds
— below the ground — see also subterranean
Esperanto:
subtera
— below the ground — see also subterranean
Finnish:
maanalainen
— below the ground — see also subterranean
French:
souterrain
— below the ground — see also subterranean
Georgian:
მიწისქვეშა
(mic̣iskveša)
— below the ground — see also subterranean
German:
unterirdisch
— below the ground — see also subterranean
German:
Untegrund-
— below the ground — see also subterranean
Greek:
υπόγειος
(ypógeios)
— below the ground — see also subterranean
Ancient Greek:
ὑπόγειος
(hupógeios)
— below the ground — see also subterranean
Ancient Greek:
ὑπόνομος
(hupónomos)
— below the ground — see also subterranean
Ancient Greek:
χθόνιος
(khthónios)
— below the ground — see also subterranean
Hindi:
भूमिगत
(bhūmigat)
— below the ground — see also subterranean
Hindi:
अंतर्भौम
(antarbhaum)
— below the ground — see also subterranean
Hindi:
ज़मींदोज़
(zamīndoz)
— below the ground — see also subterranean
Hindi:
भूगर्भस्थ
(bhūgarbhasth)
— below the ground — see also subterranean
Hindi:
भूगर्भिक
(bhūgarbhik)
— below the ground — see also subterranean
Hungarian:
föld alatti
— below the ground — see also subterranean
Icelandic:
neðanjarðar
— below the ground — see also subterranean
Ido:
subtera
— below the ground — see also subterranean
Ingrian:
maanalain
— below the ground — see also subterranean
Italian:
sotterraneo
— below the ground — see also subterranean
Japanese:
地下
(chika)
— below the ground — see also subterranean
Korean:
땅속
(ttangsok)
— below the ground — see also subterranean
Korean:
땅굴
(ttanggul)
— below the ground — see also subterranean
Korean:
땅밑
(ttangmit)
— below the ground — see also subterranean
Korean:
땅아래
(ttang'arae)
— below the ground — see also subterranean
Korean:
지하
(jiha)
— below the ground — see also subterranean
Latin:
subterrāneus
— below the ground — see also subterranean
Macedonian:
подземен
(podzemen)
— below the ground — see also subterranean
Malay:
bawah tanah
— below the ground — see also subterranean
Malay:
banah
— below the ground — see also subterranean
Māori:
rarowhenua
— below the ground — see also subterranean
Norwegian Bokmål:
underjordisk
— below the ground — see also subterranean
Polish:
podziemny
— below the ground — see also subterranean
Portuguese:
subterrâneo
— below the ground — see also subterranean
Romanian:
subteran
— below the ground — see also subterranean
Russian:
подзе́мный
(podzémnyj)
— below the ground — see also subterranean
Serbo-Croatian:
подземан
— below the ground — see also subterranean
Serbo-Croatian:
podzeman
— below the ground — see also subterranean
Slovak:
podzemný
— below the ground — see also subterranean
Slovene:
podzemen
— below the ground — see also subterranean
Spanish:
subterráneo
— below the ground — see also subterranean
Spanish:
soterraño
— below the ground — see also subterranean
Spanish:
soterráneo (disused)
— below the ground — see also subterranean
Spanish:
soterrano
— below the ground — see also subterranean
Swedish:
underjordisk
— below the ground — see also subterranean
Ukrainian:
підзе́мний
(pidzémnyj)
— below the ground — see also subterranean
Unami:
hakink
— below the ground — see also subterranean
Welsh:
tanddaearol
— below the ground — see also subterranean
Yiddish:
אונטערגרונט
(untergrunt)
— below the ground — see also subterranean
Yiddish:
אונטערערדיש
(untererdish)
— below the ground — see also subterranean
Bulgarian:
та́ен
(táen)
— hidden, furtive
Bulgarian:
подмо́лен
(podmólen)
— hidden, furtive
Catalan:
clandestí
— hidden, furtive
Catalan:
secret
— hidden, furtive
Chinese Mandarin:
地下的
(dìxià de)
— hidden, furtive
Chinese Mandarin:
秘密的
(mìmì de)
— hidden, furtive
Chinese Mandarin:
暗中的
(ànzhōng de)
— hidden, furtive