nurse (someone or something) back to health
To give close medical care and attention to someone or an animal in an attempt to return them or it to full health. The government nursed the foreign spy back to health so that he would be able to survive their torture techniques to extract information from him. The poor stray was nearly starved to death when we found her in the gutter, so we took her in and nursed her back to health until she was back to a healthy weight.
nurse someone back to health
to care for a sick person until good health returns. Sally was glad to help nurse her mother back to health. She nursed her children back to health when they all had the flu.