noun, verbal noun, の adjective
When you renew something and it ends up morally good it's definitely an improvement.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
I think there's still room for improvement on this painting.
Koichi has been trying to improve Tofugu's constitution.
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