Correct

一棍子打死

/ yī gùnzi dǎsǐ / 
Strokes

Definition

to deal a single fatal blow/(fig.) to totally repudiate sb because of a minor error

Example

Definition

knock sb down at one stroke; finish off with one/a single blow; completely negate

1
Bù
不
néng
能
yīnwèi
因为
tā
他
yǒu
有
cuòwù
错误
jiù
就
jiāng
将
tā
他
yīgùnzidǎsǐ
一棍子打死
  
。

We can't write him off as worthless because he has made some mistakes.

2
Duì
对
fàn
犯
cuòwù
错误
de
的
tóngshì
同事
  
,
yào
要
pīpíng
批评
bāngzhù
帮助
  
,
bù
不
néng
能
yīgùnzidǎsǐ
一棍子打死
  
。

Instead of bludgeoning our erring colleagues, we should help them with criticism.