除恶务尽

chú'è-wùjìn

[evil must be completely eradicated; Evils must be pulled up by the roots.One must be thorough in exterminating an evil] 驱除邪恶, 务求彻底干净

唐以屡赦而成藩镇之祸, 蔓草难图, 除恶务尽。 --《野叟曝言》七一回