Refines

verb

1. To purify; reduce to a fine, unmixed, or pure state; to free from impurities.

   "to refine gold"

2. To become pure; to be cleared of impure matter.
3. To purify of coarseness, vulgarity, inelegance, etc.; to polish.

   "a refined style"

4. To improve in accuracy, delicacy, or excellence.
5. To make nice or subtle.

   "to refine someone's language"