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#1 TOP DEFINITION
A subgroup classification within an idol group based on a shared trait. Common types: 'vocal line' (main and lead vocalists), 'rap line' (rappers), 'dance line' (main and lead dancers), '95 line' (members born in 1995), 'hyung line' (older members).
Example
“BTS's rap line (RM, Suga, J-Hope) all released solo mixtapes that showed off their individual artistry.”