undergroundadjective, adverb
uk/ˌʌn.dəˈɡraʊnd/us/ˌʌn.dɚˈɡraʊnd/underground adjective, adverb (BELOW EARTH)
B2 below the surface of the earth; below ground:
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- He suffers from claustrophobia so he never travels on underground trains.
- Ten miners were trapped underground when the roof of the tunnel fell in.
- Electrical power is supplied by underground cables.
- Planes bombed the guerrilla positions yesterday in an attempt to flush out snipers from underground tunnels.
- His grandfather had bought the land as an investment, guessing that there might be gold underground.
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The Earth & outer space - general words
- ablate
- biophilia
- cosmologist
- cosmology
- eolian
- ether
- evapotranspiration
- geocentric
- globe
- heaven
- landslide
- macrocosm
- mid-air
- slide
- terra firma
- terrestrial
- the cosmos
- the mesosphere
- the troposphere
- universe
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underground adjective, adverb (SECRET)
An underground activity is secret and usually illegal:
a secret system, used in the 19th century, by which slaves (= people who had been sold and forced to work) in the southern US were helped to escape to places where there was no slavery
Thesaurus: synonyms and related words
Secrecy and privacy
- anonymity
- anonymize
- anonymous
- backroom
- backstage
- counsel
- dissimulate
- dissimulation
- entre nous
- executive privilege
- furtive
- lip
- private
- privately
- privileged
- sanctum
- scent
- secrecy
- skeleton
- sweep
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undergroundnoun
uk/ˈʌn.də.ɡraʊnd/us/ˈʌn.dɚ.ɡraʊnd/underground noun (TRANSPORT)
a railway system in which electric trains travel through tunnels below ground:
Thesaurus: synonyms and related words
Railways & railway lines
- Amtrak
- artery
- buffer
- cable railway
- funicular
- grade crossing
- junction
- light railway
- metro
- monorail
- narrow-gauge
- point
- railroad
- railroad tie
- rapid-transit
- signal
- subway
- switch
- switchback
- track
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underground noun (PEOPLE)
[ U ] people in a society who are trying new and often shocking or illegal ways of living or forms of art:
a group of people who secretly fight against the government:
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Nomadic & alternative lifestyles
- beatnik
- bohemian
- boho
- communal
- commune
- crusty
- flower child
- go/get back to nature idiom
- greaser
- hermit
- nature
- New Age
- New Age traveller
- nomad
- rolling
- subculture
- the Beat Generation
- traveller
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