Question

what old grudge does shylock have against Antonio

Answer 1

I've already answered to your question plz have a look at that

Answer 2

Answer:

Shylock has had a grudge against Antonio for a long time now, this is because Antonio has always despised Shylock because he is a Jew and belittles him every chance he gets. He even spat on and treated him like a dog and for these very reasons Shylock has a grudge against Antonio.