Grinding and cutting
Molongqie, a Chinese idiom, Pinyin is m ó L ó ngju ā nqi, which means sharpening and exchanging. It comes from Jin Shuo by Wang Anshi of Song Dynasty.
The origin of Idioms
Wang Anshi's Jin Shuo in the Song Dynasty said, "grind the surface and cut it, immerse it in irrigation and nourishment, and prepare it after the line is finished."
Idiom explanation
It means to sharpen and learn from each other.
Grinding and cutting
engaging one to hold the " knife " -- employ a person to write an essay in one 's name - qiàn rén zhuō dāo
make up a deficiency by the surplus - jué cháng xù duǎn
sing merrily and dance gracefully - qīng gē màn wǔ