一笔抹杀

一筆抹殺
yībǐmǒshā
  1. to blot out at one stroke
  2. to reject out of hand
  3. to deny without a hearing

CEDICT

to blot out at one stroke; to condemn out of hand; to totally negate

Wiktionary

比喻轻率的全盘否定。明．沉德符《万曆野获编．嘉靖大狱张本》：「而世宗独断，直谓议礼新贵所昭雪，即跖蹻亦必曾史。遂将前后援书，一笔抹杀。」也作「一笔抹倒」、「一笔抹煞」。

重編國語辭典

轻率的全盘否定

維基詞典

Entry Composition

1 一 yī
  1. one
  2. single
  3. a (article)
  4. as soon as
  5. entire; whole; all; throughout
  6. "one" radical in Chinese characters (Kangxi radical 1)
  7. also pr. yāo for greater clarity when spelling out numbers digit by digit
2 笔 bǐ
  1. brushstroke; stroke (in painting or calligraphy)
  2. (bound form) style of writing; literary manner; technique of brushwork
  3. (classifier) stroke of a Chinese character
  4. (classifier) sum of money; financial transaction; piece of business
  5. (literary) to write (with a brush or pen)

classifiers: 支, 枝
3 抹杀 mǒshā
  1. to erase
  2. to cover traces
  3. to obliterate evidence
  4. to expunge
  5. to blot out
  6. to suppress