And the silken, sad, uncertain rustling of each purple curtain
Thrilled me--filled me with fantastic terrors never felt before;
So that now, to still the beating of my heart, I stood

from Edgar Allan Poe – The Raven on Rap Genius

Meaning

The ambiance, coupled with the tapping on the door is putting the narrator on edge.

“silken, sad, uncertain rustling” is onomatopoeic and meant to mimic the sound of the curtains.

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