Meaning of UNDERGROUND in English

UNDERGROUND

Frequency: The word is one of the 3000 most common words in English.

1.

Something that is ~ is below the surface of the ground.

Solid low-level waste will be disposed of deep ~...

The plane hit so hard that one engine was buried 16 feet ~.

ADV: ADV after v

Underground is also an adjective.

...a run-down shopping area with an ~ car park.

...~ water pipes.

ADJ: ADJ n

2.

The ~ in a city is the railway system in which electric trains travel below the ground in tunnels. (BRIT; in AM, use subway )

...a woman alone in the ~ waiting for a train...

He crossed London by ~...

N-SING: the N, also by N

3.

In a country which is controlled by an enemy or has a harsh government, the ~ is an organized group of people who are involved in illegal activities against the people in power.

These US dollars were smuggled into the country during the war, to aid the ~.

N-SING: the N

4.

Underground groups and activities are secret because their purpose is to oppose the government and they are illegal.

They are accused of organising and financing an ~ youth movement.

ADJ: ADJ n

5.

If you go ~, you hide from the authorities or the police because your political ideas or activities are illegal.

After the violent clashes of 1981 they either went ~ or left the country.

ADV: ADV after v

Collins COBUILD.      Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) .