make an unfounded attack upon sb.
It's a Chinese idiom. Pinyin is Xu è K ǒ up ē NR é n, which means to slander or abuse others with vicious words. From the wild record of Luohu.
The origin of Idioms
Song Xiaoying's "Luohu wild record" Volume 2: "bloody, first pollute the mouth; Baizhang wild fox, lose the head and go crazy."
Idiom usage
Subject predicate; predicate, object, adverbial; derogatory. Calm down, she picked up a coat from the Kang and put it on her body. She said in a blunt tone, "don't! You, you're bloody... " Chapter three of Feng Deying's bitter cauliflower.
make an unfounded attack upon sb.
do something perfunctorily as a routing practice - gù shuò xì yáng
ascend the altar and receive the appointment of general - dēng tái bài jiàng
as fierce as the mouth of a snake or the sting of a bee - shé kǒu fēng zhēn
the weather in autumn is as hot as in summer - qiū xíng xià líng
a man of distinction always has a poor memory - guì rén duō wàng