See in text (Text of the Poem)
“Creak” is a verb that means to make a harsh, shrill, or grating sound due to friction and strain. It has negative connotations that suggest extreme discomfort or auditory violence. That this horrible sound affects the speaker’s “soul” suggests that the sound has consumed the speaker. Sound in this poem builds from a drum to this “creaking” to show the growing intensity of the speaker’s fears.