切せっ磋さ琢たく磨ま

noun, noun or participle which takes 'suru', intransitive verb

diligent application; cultivating character through study

Focuses on individual effort: working hard at one's studies or self-improvement, often with a moral or character-building nuance.

• 彼かれは日ひ々び切せっ磋さ琢たく磨まして、立りっ派ぱな研けん究きゅう者しゃになった。

  He applied himself diligently every day and became a fine researcher.

noun, noun or participle which takes 'suru', intransitive verb

mutual encouragement; friendly rivalry; working hard together

Emphasizes a group dynamic: people pushing each other to improve through shared effort and healthy competition.

• 同おなじ目もく標ひょうを持もつ仲なか間まと切せっ磋さ琢たく磨ますることで、お互たがいに成せい長ちょうできる。

  By working hard together with friends who share the same goal, we can grow together.