underground★
/ˈʌndɚˌgraʊnd/
noun
/ˈʌndɚˌgraʊnd/метрополитен a system of trains that run below the ground in a big city
- We took the underground to the museum.
- Is there an underground in your city?
From the textA quick and easy way to get to different places in the city is to use an Underground train.