At last,Mister Morehouse had become speechless.

VOA: special.2010.09.18

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

Milton is narrating or representing the process by which they are silenced. They're rendered speechless or dumb, and the poem effects this process in order to give someone else an opportunity to speak.

弥尔顿在叙述或描绘这个,他们缄默的过程，他们都变得沉默或哑巴了，同时诗歌也影响了这个过程,为了使另外某个人有机会开口说话。

耶鲁公开课 - 弥尔顿课程节选