He's got some grudge against one of them.

Means to kill one of them.

A word in your ear; they'll kill him.

Do you ever bet?
Five to one, he's a dead man before the end of the week.

When is the end of the week?
Tuesday, Wednesday--no, Saturday--that's the beginning of the week--no, it isn't--the beginning of the week isn't the Sabbath--Sunday, of course--we are not Christians, we are Jews--I mean we are Jews, we are not Christians--I mean--" The claret got the better of his tongue, at last.