Improve

v. i.
  1. To grow better; to advance or make progress in what is desirable; to make or show improvement; as, to improve in health.
  2. To advance or progress in bad qualities; to grow worse.
  3. To increase; to be enhanced; to rise in value; as, the price of cotton improves.
    4. To improve on or To improve upon ,
    to make useful additions or amendments to, or changes in; to bring nearer to perfection; as, to improve on the mode of tillage.