pull down sb
It's a Chinese idiom. Pinyin is B á zh ì y ì zh ì, which means to pull out other people's flag and put on one's own. More metaphors instead. It comes from the biography of Huaiyin Hou in historical records.
The origin of Idioms
According to the biography of Huaiyin Hou in historical records, "when Zhao sees me going, he will drive me out of the empty wall. If he is ill, he will pull out the flag of Zhao and establish the red flag of Han Dynasty."
Idiom story
In the early years of the Western Han Dynasty, Han Xin led the Han Army to attack the Zhao army, and was about to arrive at jingxingkou. First, he selected 2000 light cavalry, holding a red flag, and ambushed near the Zhao camp by taking a path. Then he lined up to lure the Zhao army. When the Zhao army poured out, the Han Army pretended to be defeated and retreated. The soldiers who had been in ambush rushed into the Zhao army camp and hung the red flag of the Han Army, so the Zhao army was defeated
Idiom usage
In this battle, the army of the Tang Dynasty made great progress and changed its banner, while the Turks lost their armor.
Analysis of Idioms
A synonym: pull out Zhao's banner, establish Han's banner and replace it
pull down sb
see the view and think of a friend - qīng fēng míng yuè
stand on the edge of a pool and idly long for fish - lín chuān xiàn yú
good teachers and helpful friends - liáng shī zhèng yǒu
enhance agricultural production and economize expenses - qiáng běn jié yòng
let people call me what they will -- disregard hostile opinion - hū niú hū mǎ
even crows and sparrows hold peace and keep silence - yā mò què jìng