For a hero or a talented person to lose ambition, courage, or drive, especially due to emotional entanglements like love or overwhelming circumstances.
他年轻时意气风发，没想到晚年竟为情所困，英雄气短，令人惋惜。
He was full of youthful vigor in his youth, but unexpectedly, in his later years, he became entangled in romance, lost his drive, which was truly regrettable.
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