The question of how to practice morality and doing the right things falls under the category of ethics.
They think he's going to arrest Eliza
Answer:
I know its not an idiom, irony and I dont think its the last one so mabey a oxymoron?? Im sorry
Explanation:
Answer: You probably answered already but for anyone else who needs it
"I'll make a ghost of him" - I'll kill him
"Your bait of falsehood takes this carp of truth" - You lie so you can find out the truth
"These words like daggers enter in mine" - These words are painful to hear
"The natural gates and alleys of the body" - veins and arteries