“Improving one's nature” in Japanese
Short answer
Improving one's nature in Japanese is “性懲り” (shoukori). Full meaning: repenting, improving one's nature.
Other ways to say “Improving one's nature” in Japanese
性こり
shoukori repenting, improving one's nature
性コリ
shoukori repenting, improving one's nature
しょうこり
shoukori repenting, improving one's nature
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