Thin tongue
It's a Chinese idiom. Pinyin is k ǒ UQ ī ngsh é B ó, which means to describe being mean and sharp. It's from Tian Yu Hua.
Analysis of Idioms
Sharp and mean
Idiom usage
If you don't know what's good for you, you'll just make fun of others. Qian Zhongshu's Fortress Besieged
The origin of Idioms
"Tianyuhua" Chapter 25: "no kindness at a young age, who do you want to insult
Thin tongue
There is a lot of grazing in the forbidden area - jìn zhōng pō mù
cause of vital and lasting importance - bǎi nián zhī yè
The river is tumbling over the sea - jiāng fān hǎi rǎo
We can see it from time to time - jiàn xiàn céng chū