a swearing of brotherhood （绝对准确）
沥血以誓
例句：
1.如许的剧情或多或少会让我们回想起红极一时的香港影片《古惑仔》。剧中，类似街斗、出进倡寮、粗口、沥血以誓等场景都是必不成少的。
It may, more or less, remind us of the HongKong classic Teddyboy series, where things like street fights, visits tobrothels, and a swearing of brotherhood ceremony are indispensable.
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