To disfigure the mouth -- this is how I would interpret it -- to disfigure the mouth has a primary effect in rendering one at least temporarily speechless.

把嘴巴丑化--这就是我所理解的-,丑化自己的嘴巴使自己暂时不能说话,它是有十分重要影响的。

耶鲁公开课 - 弥尔顿课程节选

She says nothing after this encounter, remaining silent or speechless for the rest of the mask, but Milton clearly finds, I think, something threatening here.

在这次相遇中她什么都没说，在接下来中也保持着沉默寡言，可我认为弥尔顿在这里找到了一些威胁。

耶鲁公开课 - 弥尔顿课程节选