周瑜打黃蓋 [ㄓㄡ ㄩˊ ㄉㄚˇ ㄏㄨㄤˊ ㄍㄞˋ; zhou1 yu2 da3 huang2 gai4]
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 before the 208 battle of Redcliff 赤壁之戰[ㄔˋ ㄅㄧˋ ㄓ ㄓㄢˋ; chi4 bi4 zhi1 zhan4]
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