1. To make (something) better; to increase the value or productivity (of something).
  2. To become better.
  3. To disprove or make void; to refute.
  4. To disapprove of; to find fault with; to reprove; to censure.
    to improve negligence
  5. To use or employ to good purpose; to turn to profitable account.
    to improve one's time; to improve his means

The above text is a snippet from Wiktionary: improve
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