Answer: But whose velvet violet lining with the lamp-light gloating o'er,
She shall press, ah, nevermore”
Respite—respite and nepenthe from thy memories of Lenore!
Quaff, oh quaff this kind nepenthe, and forget this lost Lenore!"
Step-by-step explanation:
“But whose velvet violet lining with the lamp-light gloating o'er,
She shall press, ah, nevermore”
He realizes that Lenore will no longer sit on that chair again. It dawned on him that Lenore shall press no more the velvet violet lining of the cushion she used to sit.
Respite—respite and nepenthe from thy memories of Lenore!
Quaff, oh quaff this kind nepenthe, and forget this lost Lenore!"
In these lines he urges to have Nepenthe. Nepenthe was a drink or a potion in mythology that helped one forget.
He seems to imply he needs some potion to help him make the memories of Leonor fade away.