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In the early days of the Three Kingdoms period, Emperor Xian, Prime Minister Cao Cao, and Liu Bei went on a hunting expedition. Cao Cao deliberately rode alongside the Emperor to display his military prowess.
Seeing a rabbit, the Emperor asked Liu Bei to shoot it, praising his archery skills when Liu Bei hit the target.
Later, the Emperor spotted a large deer and missed three shots, so he asked Cao Cao to shoot. Cao Cao took the Emperor's golden arrow and successfully shot the deer. The soldiers, seeing the golden arrow, mistakenly believed the Emperor had made the shot and cheered, 'Long live the Emperor!' Cao Cao proudly stood before the Emperor, accepting the accolades.
Guan Yu, unable to bear this sight, prepared to strike Cao Cao with his saber, but Liu Bei quickly signaled him to refrain from any rash action.
Afterwards, Guan Yu asked Liu Bei why he prevented him from attacking Cao Cao. Liu Bei replied, '投鼠忌器 (throw at a rat but fear damaging the vessels); the Emperor was right by his side.'

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Open the tool →投鼠忌器 (tóu shǔ jì qì) is a Chinese idiom (chengyu) meaning “to hesitate to act against a wrongdoer for fear of harming an innocent party or something else valuable; to be scrupulous about the consequences of one's actions”.
投鼠忌器 is pronounced tóu shǔ jì qì in Mandarin Chinese.
Literally, 投鼠忌器 means “to throw at a rat, fearing to break the nearby vessels”. It is used to mean “to hesitate to act against a wrongdoer for fear of harming an innocent party or something else valuable; to be scrupulous about the consequences of one's actions”.
投鼠忌器 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
投:用东西去掷;忌:怕,有所顾虑。想用东西打老鼠,又怕打坏了近旁的器物。比喻做事有顾忌,不敢放手干。