noun
secondary account; alt account; backup account
Refers to an additional account on social media, online services, or games, often used for privacy, testing, or separating purposes.
サブアカウントで本名を使わずに投稿している。
I post without using my real name on my secondary account.
ゲームのサブアカウントを作って、初心者に戻った気分を味わった。
I created a sub account for the game and enjoyed feeling like a beginner again.