1To be energetically and successfully active, achieving notable results — used for outstanding performance in work, sports, or social settings.
彼女は国際大会で大いに活躍した。
She performed brilliantly at the international competition.
新入社員が早くも活躍している。
The new employee is already making a name for themselves.
あの俳優は映画とドラマの両方で活躍中だ。
That actor is currently active in both films and TV dramas.
引退後もボランティア活動で活躍している。
Even after retiring, they remain active in volunteer work.
このアプリはビジネスの現場で幅広く活躍している。
This app is widely used and effective in business settings.
2To move about vigorously — an older, literal sense that is essentially unused in modern Japanese (today the word is used almost exclusively in the sense above).