板上钉钉

板上钉钉
bǎnshàng-dìngdīng
[clinch a deal; finalize a decision (plan, etc); finally determined] 比喻事情已经决定, 无可改变

海云是已经定性, 已经作了板上钉钉的正式结论的阶级敌人。 --王蒙《蝴蝶》


Advanced Chinese dictionary. 2013.

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