v. t. - To change or modify in any way for the better
v. t. - by simply removing what is erroneous, corrupt, superfluous, faulty, and the like;
v. t. - by supplying deficiencies;
v. t. - by substituting something else in the place of what is removed; to rectify.
v. i. - To grow better by rectifying something wrong in manners or morals; to improve.