把某人黑了英语怎么说

在英文中，表示"把某人黑"的常用表达是"to defame someone"或者"to smear someone's reputation". 其中，"defame"的意思是"诽谤，诋毁（某人的名誉）"，"smear"的意思是"抹黑，污蔑（某人的名誉）"。
举个例子，可以这样说：
He was accused of defaming his opponent during the election campaign. 他在竞选期间被控诽谤他的对手。
She was smeared by her political enemies for speaking out against corruption. 她因为反对腐败而遭到政敌的污蔑。
同时，还可以用其他表达来描述这种行为，例如：
He was accused of spreading lies about his opponent. 他被指控散布有关他对手的谣言。
She was attacked by her opponents for speaking out against corruption. 她因为反对腐败而遭到对手的攻击。
总之，"to defame someone"和"to smear someone's reputation"是表示"把某人黑"的常用表达，但是也可以用其他表达来描述这种行为，例如"to spread lies about someone"和"to attack someone".