I'm not sure what the sample dictionary entry is, but an allusion is basically when something is being referenced indirectly. For example, I could say "I'm not the hero this town needs, I'm the hero this town deserves" and that would be an allusion to batman since I'm referencing the film without directly explaining where it's from.
Answer: "Pangs of dispriz'd love" refers to Hamlet's relationship with Ophelia. She was ordered by her father to rebuke, or reject, his affections. So this quote is basically Hamlet saying "pains of despised love," referencing his rejection.
The battle between Beowulf and Grendal was aggressive. It was violent and displayed the strength between the masculine figures. It was the force between good and evil. The narrator has Christian views that is clearly demonstrated through this battle. It is stated that Beowulf received his strength that defeated Grendal by God.
