一笔抹煞

Explanation: Ignore the write-off. A painting, all erase. Lightly compared to results, benefits all negative. 　　Usage: Partial official; as predicate; with derogatory 　　Source: Qing Liu E, "Travels," the 11th back to heaven so odd disaster, North fist south leather, to ancient sages denies it, this is Ziranzhili, not surprising. " 　　Examples: We all should be divided, not because he made a mistake, it ~ his advantage. Thesaurus:  lump together under one head, to undo somethilng by a silngle stroke, stroke efface, Stroke Mosa, spring-clean Antonym Group:  split across, Divide into two