refines

third-person singular simple present indicative of refine

(transitive) To purify; reduce to a fine, unmixed, or pure state; to free from impurities.
(intransitive) To become pure; to be cleared of impure matter.
(transitive) To purify of coarseness, vulgarity, inelegance, etc.; to polish.
(ambitransitive) To improve in accuracy, delicacy, or excellence.
(transitive) To make nice or subtle.