东山再起 Make a comeback
Explanation
比喻人失势后重新得势，也指重新开始，再创辉煌。
This idiom means to regain power after losing it, or to start over and achieve great success again.
Origin Story
东晋时期，谢安辞去官职，隐居会稽东山。他常与朋友饮酒赋诗，过着悠闲的生活。后来，前秦军队南下，东晋王朝岌岌可危。朝廷派人请谢安出山，他毅然接受了使命，率领军队取得了淝水之战的胜利，最终保卫了东晋的江山。谢安东山再起，成为东晋的擎天柱，使东晋王朝得以延续，并最终走向复兴。
During the Eastern Jin Dynasty, Xie An resigned from his official post and retired to Mount Dongshan in Kuaiji. He often drank and wrote poetry with his friends, living a leisurely life. Later, the army of the Former Qin marched south, and the Eastern Jin Dynasty was in jeopardy. The court sent someone to ask Xie An to come out of retirement, and he resolutely accepted the mission, led his army to victory in the Battle of Fei Shui, and ultimately defended the Eastern Jin Dynasty. Xie An's return to power made him the pillar of the Eastern Jin Dynasty, allowing the dynasty to continue and eventually flourish.
Usage
这个成语常用来形容一个人在经历挫折或失败后，重新振作，取得成功。
This idiom is often used to describe someone who has experienced setbacks or failures and then makes a comeback to achieve success.
Examples
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他虽然失业了，但相信自己能够东山再起。
tā suīrán shī yè le, dàn xiāngxìn zìjǐ nénggòu dōng shān zài qǐ.
He lost his job, but believes he can make a comeback.
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经历了挫折后，他重整旗鼓，东山再起，最终取得了成功。
jīnglì le cuò zhí hòu, tā chóng zhěng qí gǔ, dōng shān zài qǐ, zhōng jiū qǔ dé le chénggōng
After setbacks, he regrouped, made a comeback and eventually achieved success.