line
What does line mean?
A subset of group members grouped by what they bring to the table. Vocal line = the singers. Dance line = the dancers. Rap line = the rappers. Visual line = the faces. Plus age-based lines like hyung line (older members) and maknae line (younger). Fans use these constantly to talk about who's carrying what part of a comeback.
Origin
From 'county lines', the National Crime Agency term for the cross-border phone-led drug supply model that emerged in the early 2010s.