びょうこん

病根
cause of a disease
root of an evil

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びょうこん【病根】

the cause [origin, root] of a disease; 〔禍根〕 the root [cause] of an evil.

●病根を断つ 〔病原を〕 get rid of the cause of a disease; 〔禍根を〕 strike at the root of an evil.