underground

/ˌʌndəɡɹˈaʊnd/

/ˈəndɝˌɡɹaʊnd/

Underground

a city's railway system that is below the ground, usually in big cities

synonyms : metro

a secret group organized to overthrow a government or occupation force

synonyms : resistance

underground

under the level of the ground

conducted with or marked by hidden aims or methods

underground

under the surface of the earth

in or into hiding or secret operation

Examples

1. The subway station is underground and has multiple entrances.

2. The beetle burrowed into the soft soil to create its underground home.

3. Sinkholes happen when water eats away at underground rock, creating pits and craters.

4. The next target meets his end underground, in the coils of the corkscrew plant.