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
Chinese PinYin : kǒu qīng shé bó
Thin tongue
leaning on a horse to dash off a piece in no time. yǐ mǎ kě dài
there are ministers in the home of a statesman. xiàng mén yǒu xiàng