To nurture; to foster; to tend.
To turn or stir soil in preparation for planting.
To grow plants, notably crops.
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.