omerta
n. 拒绝作证(黑手党徒的一种行为准则)
例句
Even a Sicilian sentenced to twenty years might break the omerta and talk his brains out.
即使一个西西里人,若被判二十年徒刑,也可能打破“缄默”的原则,把肚子里的话全说出来。