to abet an ill-doer
... to be an apple of Sodom 外强中干 to abet an ill-doer 助桀为虐 the thrust and parry of A and B 唇枪舌剑 ...
an exemplary person or thing
助桀为虐，汉语成语，拼音为zhù jié wéi nüè，比喻帮助坏人干坏事。出自西汉·司马迁《史记·留侯世家》。
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