underground

nouncountableB1UK /ˌʌn.dəˈɡɹaʊnd/ US /ˌʌn.dəɹˈɡɹaʊnd/

The regions beneath the surface of the earth, both natural (eg. caves) and man-made (eg. mines).
Synonym of subway: a railway that is under the ground.UK
A movement or organization of people who resist political convention.with a definite article
A movement or organization of people who resist artistic convention.with a definite article

Forms

Example sentences173 results

In the London underground there is a warning to "mind the gap" when boarding the train.

The plant has an underground stem.