What is a epimone and a rhetorical example of it?
Epimone is the frequent repetition of a phrase or question to dwell on a point.
We can see this in James Joyce's work, Ulysses:
"All his brains are in the nape of his neck, Simon Dedalus says. Welts of flesh behind on him. Fat folds of neck, fat, neck, fat, neck."
See how the speaker is emphasizing the other person's plump appearance? He is stating that the person is so fat, that their neck is just an endless roll of fat.