LOL!
I guess Eowyn understood not a word of this sophisticated threat. Pity she had so little interest in metaphysics (or was too distracted by her petty personal problems) to ask Wiki to elaborate

:
Eowyn: Begone, foul dwimmerlaik, lord of carrion! Leave the dead in peace!’
Wiki: ‘Come not between the Nazgūl and his prey! Or he will not slay thee in thy turn. He will bear thee away to the houses of lamentation, beyond all darkness, where thy flesh shall be devoured, and thy shrivelled mind be left naked to the Lidless Eye.’
Eowyn: Er... sorry Mr Dwimmerlaik, I am not sure I get this ...what did you just say about lamentation?
Wiki *purrs*: Come, I will ssshow you...