ㄉㄧㄢˇㄊㄧㄝˇㄔㄥˊㄐㄧㄣdiǎntiě‑chéngjīn

点铁成金
  1. 神話仙人手指一點便使變成金子比喻只要略加改動使平常事物變成有價事物點石成金」。

to touch base matter and turn it to gold (idiom)​; fig. to turn crude writing into a literary gem