长袖善舞 — “Long sleeves good at dancing”

The idiom '长袖善舞' (cháng xiù shàn wǔ) originates from a lament by the historian Sima Qian, inspired by figures like Fan Ju and Cai Ze from the late Warring States period.

Fan Ju, originally from Wei, was once severely beaten for false accusations. He then fled to Qin, changed his name to Zhang Lu, and advised King Zhaoxiang with his 'distant alliances, close attacks' strategy, eventually becoming the prime minister.

Cai Ze, from Yan, also came to Qin after failing to gain recognition elsewhere. He impressed King Zhaoxiang with his eloquent arguments and similarly became prime minister, though for a short period, and remained a respected figure in Qin for many years.

Both Fan Ju and Cai Ze were known as '辩士' (biàn shì), or skilled debaters and eloquent speakers, who earned the trust and high positions from the Qin kings through their rhetorical prowess. Observing how such individuals, with their 'long sleeves' of eloquence and connections, could skillfully navigate the political landscape and achieve success, Sima Qian made the poignant remark: 'Long sleeves help one dance skillfully; those with money know how to do business.'

This observation highlights the advantage one has when possessing the right resources, skills, or backing, making it easier to maneuver and succeed, much like long sleeves aiding a dancer's performance.