American Dictionary

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Definition underground in American English

underground adverb

adverb
/ˌʌndərˈɡraʊnd/
1

below the surface of the ground

Example

miners who work all day underground

Example

Many species of beetle live underground.

Synonyms and related words
2

in or to a secret place away from the police or other authorities

Example

Left-wing activists were driven underground after the coup.

Example

The police became suspicious and he had to go underground.

Synonyms and related words
Definition underground in American English