underground Meaning in Cambridge English Dictionary
Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

Meaning of "underground" - English Dictionary

See all translations

undergroundadjective, adverb

uk   /ˌʌn.dəˈɡraʊnd/  us   /-dɚ-/

underground adjective, adverb (BELOW EARTH)

B2 below the surface of the Earth; below ground: an underground cave/passage/cable Moles live underground.
More examples

underground adjective, adverb (SECRET)

An underground activity is secret and usually illegal: an underground newspaper/movement The Communist Party was forced (to go) underground, and its leaders went into hiding.

undergroundnoun

uk   /ˈʌn.də.ɡraʊnd/  us   /-dɚ-/

underground noun (TRANSPORT)

the underground A2 [S] (also the tube) UK a railway system in which electric trains travel along passages below ground: the London Underground They went on the underground.

underground noun (PEOPLE)

[U] people in a society who are trying new and often shocking or illegal ways of living or forms of art: In Britain and the USA in the 1970s, the underground was a powerful subversive force.the underground a group of people who secretly fight against the government: He was a member of the underground, harassing the invading army.
(Definition of underground from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of underground?
Add Cambridge dictionaries to your browser to your website

Definitions of “underground” in other dictionaries

Word of the Day
athlete

a person who is very good at sports or physical exercise, especially one who competes in organized events

Word of the Day

When’s dinner? (Words for different meals)
When’s dinner? (Words for different meals)
by Kate Woodford,
July 22, 2015
Here at ‘About Words’ we’re always happy to get ideas for posts that we could write. A reader of this blog recently asked for a post on the language of meals and we thought this an excellent idea. If you are reading this post and have an idea for a topic or

Read More 

exoskeleton noun
exoskeleton noun
July 27, 2015
a robotic device which goes around the legs and part of the body of a person who cannot walk and allows them to move independently and in an upright position The device, known as an exoskeleton, is strapped to the outside of a person’s limbs and can then be controlled by them.

Read More