切磋琢磨

せっさたくま · sessatakuma
四字熟語 Tier 0 · must-include
Literal
cut, file, carve, polish
Figurative
diligent application (to work or study)

Meanings

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

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にんい — おへんじがひつようなばあいのみ。