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to cheer up; to be encouraged (by); to be in high spirits
彼の言葉に心が奮い立つ。
My spirit is roused by his words.
指揮官の演説で兵士たちは奮い立った。
The soldiers were stirred up by the commander's speech.
チームは奮い立って、強敵との決勝戦に挑んだ。
The team, fired up, challenged a formidable opponent in the final match.