Final answer:
The sound device that appears in the bolded words is consonance.
Step-by-step explanation:
The sound device that appears in the bolded words is consonance.
Consonance is the repetition of consonant sounds within words or at the end of words. In this case, the consonant sound 'sh' is repeated in the words 'dial-youth' and 'shadow goes'.
For example, in the phrase 'a shifting shadow goes', the 'sh' sound is repeated in the words 'shifting' and 'shadow'.
Learn more about Sound devices in poetry