起死回生 bring back to life
Explanation
比喻将快要死的人救活，也比喻将已经没有希望的事物挽救过来。
It is used to describe someone who saved someone who was dying, or something that had no hope left.
Origin Story
春秋战国时期，名医扁鹊医术高明，精通各种疑难杂症。一次，他听说齐国太子暴病身亡，立即前往诊治。面对太子冰冷的遗体，扁鹊却冷静地观察他的脸色和呼吸，判断太子只是假死，并非真的死亡。于是，他让随从取来针灸工具，在太子身上进行针灸施救。经过一番精心操作，太子终于睁开了双眼，恢复了呼吸。扁鹊又为太子开具汤药，悉心照料，最终使太子痊愈，重返健康。此事在当时引起了巨大的轰动，扁鹊“起死回生”的医术也名扬天下。
During the Spring and Autumn and Warring States periods, the famous doctor Bian Que was known for his superb medical skills and expertise in various difficult and complicated diseases. Once, he heard that the crown prince of Qi had suddenly died from a serious illness and immediately went to treat him. Facing the prince's cold body, Bian Que calmly observed his face and breathing, judging that the prince was only in a state of apparent death, not actually dead. Therefore, he had his attendants fetch acupuncture tools, and performed acupuncture on the prince. After a careful procedure, the prince finally opened his eyes and resumed breathing. Bian Que then prescribed medicine for the prince and carefully looked after him, eventually restoring the prince to full health. This incident caused a huge sensation at the time, and Bian Que's skill in bringing people back from the dead became famous throughout the land.
Usage
形容医术高明，也比喻将已经没有希望的事物挽救过来。常用于医疗和事业方面。
It's used to describe superb medical skills and also to describe something that had no hope left being rescued.
Examples
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老中医妙手回春，竟然把垂危的病人起死回生。
lǎo zhōngyī miàoshǒu huí chūn, jìngrán bǎ chuíwēi de bìngrén qǐ sǐ huí shēng.
The old Chinese doctor brought the dying patient back to life with his superb medical skills.
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经过医生的全力抢救，病人终于起死回生了。
jīngguò yīshēng de quánlì qiǎngjiù, bìngrén zhōngyú qǐ sǐ huí shēng le.
After the doctor's strenuous rescue efforts, the patient finally came back to life.
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这家公司濒临倒闭，经过他的努力，终于起死回生了。
zhè jiā gōngsī bīnlín dǎobì, jīngguò tā de nǔlì, zhōngyú qǐ sǐ huí shēng le。
The company was on the verge of bankruptcy, but through his efforts, it finally came back to life.