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noun (common) (futsuumeishi), noun or participle which takes the aux. verb suru
being very active, being very useful, playing a very active part, making a spectacular showing, great efforts, splendid work
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2人とも今日は大活躍だったみたいね。先生も鼻が高いわ。
You've both been very impressive today. I'm proud of you.
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