Jisho

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Noun, Suru verb, Intransitive verb
1. diligent application (to work or study); cultivating one's character by studying hardYojijukugo (four character compound)
Noun, Suru verb, Intransitive verb
2. mutual encouragement (to improve); working hard together; friendly rivalryYojijukugo (four character compound)
Other forms
切瑳琢磨 【せっさたくま】

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