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.
To make (someone) increasingly aware of, in a concerned or sensitive way.
To render capable of being acted on by actinic rays of light.
To make (someone or something) sensitive or responsive to certain stimuli.