noun
Refers specifically to a group chat within the LINE instant messaging application, not a generic group chat.
See also: ＬＩＮＥ
グループＬＩＮＥで待ち合わせ場所を決めた。
We decided on the meeting place in the LINE group chat.
クラスのグループＬＩＮＥに招待された。
I was invited to the class's LINE group chat.
ＬＩＮＥ is the overall messaging app; グループＬＩＮＥ specifically refers to a group chat within that app.
A generic term for any group chat; グループＬＩＮＥ is specific to the LINE platform.
Compound of グループ (group) and ＬＩＮＥ (the messaging app name).