周瑜打黃蓋

zau1 jyu4 daa2 wong4 goi3

fig. with the connivance of both sides · fig. by mutual consent · cf Wu patriot Huang Gai submits to mock beating at the hands of General Zhou Yu to deceive Cao Cao 曹操[Cao2 Cao1]{cou4 cou1} before the 208 battle of Redcliff 赤壁之戰|赤壁之战[Chi4 bi4 zhi1 Zhan4]{cek3 bik1 zi1 zin3}