To superficially alter something in the hope of making it seem more appealing than it is in actuality.
To make nice or subtle.
To improve in accuracy, delicacy, or excellence.
To become pure; to be cleared of impure matter.
To purify of coarseness, vulgarity, inelegance, etc.; to polish.
To purify; reduce to a fine, unmixed, or pure state; to free from impurities.