noun
underground idol; member of a non-famous idol group
Refers to idols who perform at small live houses and events, often without major-label backing or mainstream media exposure. The term contrasts with major-label idols and carries a DIY, grassroots connotation.
See also: アイドル
彼女は週末に地下アイドルとしてライブハウスで歌っている。
She sings at a live house on weekends as an underground idol.
最近、地下アイドルの人気が高まっている。
Recently, underground idols have been gaining popularity.