noun
eradication of evil at its root; striking at the root of evil
A yojijukugo meaning to eliminate the fundamental cause of evil or trouble. Used in formal or literary contexts.
社会の悪を抜本塞源するには、教育の改革が不可欠だ。
To eradicate the root of society's evils, educational reform is essential.
抜本 means 'pulling out the root' and is used in compounds like 抜本的 (radical). 抜本塞源 is a more emphatic, classical four-character phrase.
A yojijukugo of Chinese origin, combining 抜 (pull out), 本 (root), 塞 (block), and 源 (source), literally 'pull out the root and block the source'.