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to grow wild; to run to waste; to become degenerate
to become rough (of art, craft, etc.); to lose refinement; to deteriorate (of skill)
to intensify (of wind, rain, etc.); to become more severe
手入れを怠ると庭が荒んでくる。
The garden becomes wild if you neglect its care.
生活が荒んで体調を崩した。
My lifestyle deteriorated and my health suffered.
心が荒まないように気をつけている。
I'm careful not to let my spirit grow rough.