一棍子打死 [- ɡùn zi dǎ sǐ]knock sb. down at one stroke; completely negate; deal a fatal blow; finish off with one blow;finish off with a single blow;kill with one blow;shatter at one stroke:
•¶ 对犯错误的同志， 要批评帮助， 不能一棍子打死。 Instead of bludgeoning our erring comrades, we should help them with criticism.