枯木逢春

kūmùféngchūn
  1. lit. the spring comes upon a withered tree (idiom)
  2. fig. to get a new lease on life
  3. to be revived
  4. (of a difficult situation) to suddenly improve

CEDICT

to get a new lease of life in a desperate situation

Wiktionary

比喻虽处于绝境却重获生机，或劣境忽然转好。《喻世明言．卷九．裴晋公义还原配》：「两口儿回到家乡，见了岳丈黄太学，好似枯木逢春，断弦再续，欢喜无限。」也作「枯树生华」。

重編國語辭典

虽处于绝境却重获生机，或劣境忽然转好

維基詞典

Entry Composition

1 枯木 kūmù dead tree
2 逢 féng
  1. to meet by chance
  2. to come across
  3. (of a calendar event) to come along
  4. (of an event) to fall on (a particular day)
  5. to fawn upon
=3 春 chūn old variant of 春 chūn
=3 春 chūn
  1. spring (season)
  2. gay
  3. joyful
  4. youthful
  5. love
  6. lust
  7. life