English Dictionary

underground

/ˌʌndəˈɡɹaʊnd/

noun

(geography) Regions beneath the surface of the earth, both natural (eg. caves) and man-made (eg. mines). / (chiefly Britain) Synonym of subway: a railway that is under the ground.

The underground is the fastest way to travel in the city.

意味（1）

(geography) Regions beneath the surface of the earth, both natural (eg. caves) and man-made (eg. mines).

意味（2）

(chiefly Britain) Synonym of subway: a railway that is under the ground.

London Underground

意味（3）

(with definite article) A movement or organisation of people who resist political convention.

the French underground during World War II

意味（4）

(with definite article) A movement or organisation of people who resist artistic convention.