diligent application (to work or study); cultivating one's character by studying hard; mutual encouragement (to improve); working hard together; friendly rivalry
polish (jewels); cultivation
to polish; to shine; to burnish; to refine (a skill, etc.); to improve; to hone
diligent application (to work or study); cultivating one's character by studying hard; mutual encouragement (to improve); working hard together; friendly rivalry