一笔抹杀，汉语成语，拼音是yī bǐ mǒ shā，意思是比喻轻率地把成绩、优点全部否定。出自《野获编》。
他把我的论证轻蔑地一笔抹杀，认为不值一驳。
He dismissed my argument contemptuously as not worth refuting.
你批评他当然是可以的，可是你却粗暴地把他一笔抹杀了。
You could of course have criticized him, but instead, you cried him down rudely.
（到时候）个体间关系的残余，连同他们的同感和情操，都将被一笔抹杀，灰飞烟灭。
The remnants of person-to-person relationships, with their sympathy and sentiment, will be snuffed out.
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