Definitions from Wiktionary ( )

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

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