一笔抹杀 wipe out with a stroke
Explanation
轻率地否定成绩、优点。比喻不公平地全部否定。
To casually negate achievements and merits. A metaphor for unfairly negating everything completely.
Origin Story
话说唐朝时期，有个年轻秀才，寒窗苦读十年，终于考中了进士。他满心欢喜，回家报喜，却遭到父亲的冷嘲热讽。父亲认为他读书十年，一无所成，还不如务农，便一笔抹杀了他多年的努力和成就。秀才心灰意冷，从此不再读书，结果多年以后，他连温饱都成问题，后悔莫及。
In the Tang Dynasty, there was a young scholar who studied hard for ten years and finally passed the imperial examination. He was overjoyed and went home to share the good news, but was met with his father's ridicule and sarcasm. His father believed that he had studied for ten years without achieving anything, and that it would have been better to farm, so he dismissed his years of hard work and achievements. The scholar was disheartened and stopped studying. Years later, he had trouble making ends meet and deeply regretted it.
Usage
用于比喻轻率地否定成绩、优点。
Used to describe the casual dismissal of achievements and merits.
Examples
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他之前的努力都被领导一笔抹杀了，让他感到很沮丧。
ta zhiqian de nuli dou bei lingdao yibi mo sha le, rang ta gandao hen jusang.
His previous efforts were all wiped out by the leader, which made him very frustrated.
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不要一笔抹杀他的所有努力，他还是有一些值得肯定的地方。
buya yibi mo sha ta de suoyou nuli, ta haishi you yixie zhide kending de difang.
Don't dismiss all his efforts; he still has some things worth acknowledging.