underground

noun [U]

/ˈʌn·dərˌɡrɑʊnd/

Definition

› The underground is an organization that secretly works against those in power: He was a member of the French underground in World War II.

(Definition of underground noun from the Cambridge Academic Content Dictionary © Cambridge University Press)

to express disagreement or refuse to do something

Read our blog about how the English language behaves.

Find words and meanings that have just started to be used in English, and let us know what you think of them.