American Dictionary

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Definition underground in American English

underground adjective

adjective
/ˈʌndərˌɡraʊnd/
1

below the surface of the ground

Example

an underground passage/tunnel/cable

Synonyms and related words
Example

He had been a member of an underground resistance movement.

Synonyms and related words
2.1

not well known by most people and different from what is usual or popular

Synonyms and related words
Definition underground in American English