Changing column and stretching string
Changing Qin Zhu is a Chinese idiom. Pinyin is g ǎ izh ù zh ā ngxi á n, which means another Qin string. It refers to reforming the system or changing the method. It's from the story of the Golden Lotus · shece.
The origin of Idioms
Chen Ruyuan of the Ming Dynasty wrote in "the story of the Golden Lotus · shece" that "Yu Bi Shuqi hugs and sees Suo Wei crying and starving, but he changes the column and opens the string, and only then he can visit Tao."
Idiom usage
Used as predicate, object, attribute, etc
Changing column and stretching string
just miss the person or opportunity - shī zhī jiāo bì
give confidential instructions in person - miàn shòu jī yí
harass the people and waste money - láo mín fèi cái