切磋琢磨

Meaning

1. nvsvi
   diligent application (to work or study); cultivating one's character by studying hard
2. nvsvi
   mutual encouragement (to improve); working hard together; friendly rivalry

Example sentences

• 君の実力なら楽勝だとは思うが、それに驕らず、まずはクラスのみんなと切磋琢磨していって欲しい。

  With your ability it should be a doddle, but please don't get too big for your boots: apply yourself diligently like everyone in your class.