What does it mean to kill half the sky with one sword?

Killing half the sky with one sword means the popularity of the TV series "Qingyun Zhi". Kill half the sky with one sword, and doubt everything is old. This poem is from the TV series Qing Yun Zhi, which is an immortal drama adapted from Ding Xiao's novel Zhu Xian and produced by Huanrui Century Film and Television Media Co., Ltd.