Jisho

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Noun or verb acting prenominally
1. underground (film, theater, etc.); unconventional; alternative; experimental; radicalSee also アングラ
Noun or verb acting prenominally
2. underground (economy, press, etc.); unofficial; illegal; black (money); shady; of unknown originSee also アングラ
Wikipedia definition
3. Underground
Other forms
アンダーグランド

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