To make this bitter to thee.
I asked for Copilot's interpretation of this line in order to gain a better interpretation of what the Shakespearean intention behind this line was. It said that this was more of a threat of verbal power than one of physical imposition, which was what I suspected anyway. The fact that this threat is one of verbal sharpness indicates that Brabantio either means the two outside his window no actual harm or that he does not have the power to punish them through force anyway.