周瑜打黄盖 周瑜打黃蓋

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 Cáo Cāo before the 208 battle of Redcliff 赤壁之战 Chì bì zhī Zhàn